Reducing Tee, Slip x Slip x Slip PVC Schedule 40 10" x 10" x 6" (401-626)

The 10" x 10" x 6" Schedule 40 White PVC Reducing Tee (401-626, Slip x Slip x Slip) is a large-diameter thermoplastic reducing tee fitting manufactured to ASTM D2466 in Schedule 40 white PVC — in which both run connections are 10" IPS slip socket ends and the branch connection is a 6" IPS slip socket end, providing a single-body Schedule 40 PVC solution for connecting a 6" IPS socket PVC branch assembly perpendicularly to a 10" Schedule 40 PVC primary run at a branch location where the 10" primary run continues at full diameter through both straight-run ports downstream of the 6" branch connection, without a saddle tap, without field fabrication, without transitioning out of Schedule 40 white PVC construction at the primary main branch point, and without interrupting the 10" primary run's continuity at the branch location. The 401-626 is the correct fitting wherever a 10" Schedule 40 PVC primary main must provide a 6" IPS socket PVC perpendicular branch connection while maintaining the full 10" primary run diameter through both run sockets — where the 6" downstream branch system is permanently bonded socket PVC construction continuing in 6" IPS socket PVC pipe and fittings from the tee's branch socket, where the primary main must continue downstream of the 6" branch at full 10" diameter serving additional primary distribution or transmission demands, and where the branch connection must be a manufactured, rated, NSF-listed, ASTM D2466-compliant Schedule 40 white PVC tee body whose 6" branch socket accepts standard 6" IPS Schedule 40 or Schedule 80 PVC pipe directly in the factory-formed female socket of the tee's branch port. Positioned between the 401-628 (10"x10"x8" at 80%) and the 401-624 (10"x10"x4" at 40%) in the Spears 401 series at the 10" run service level, the 401-626 is the large-secondary-distribution and major-zone-supply branch tee of the 10" Schedule 40 PVC socket fitting ecosystem — the configuration that serves the commercial space between the near-equal primary infrastructure role of the 401-628 above it and the intermediate-lateral secondary distribution role of the 401-624 below it, where the 6" socket branch delivers a substantially larger flow fraction to a large secondary distribution system, major zone supply header, or large-capacity fire protection distribution main than the 4" and smaller branch configurations can provide at standard design velocities.

The 401-626's position within the Spears 401 series all-socket reducing tee line at the 10" run service level is fully defined by the 60% branch-to-run ratio, the approximately 36% cross-sectional area ratio, and the ~2.78x velocity increase that together establish the 6" IPS branch's hydraulic character relative to the continuing 10" run at the tee junction. At approximately 36% cross-sectional area, the 6" IPS branch socket carries a substantial but definitively sub-primary fraction of the 10" run's total flow capacity when both run and branch flows are considered at the tee junction — the 10" primary run remaining hydraulically dominant over the 6" branch at all normal primary distribution operating conditions where the branch supplies only its designed secondary distribution fraction. The ~2.78x velocity increase at constant full-flow passage through the 6" branch socket establishes that the full 10" primary main design flow cannot pass through the 6" branch socket at standard primary main design velocities: at a standard 10" primary main design velocity of 3 feet per second, a hypothetical full-flow passage through the 6" branch socket would produce a 6" downstream velocity of approximately 8.3 feet per second — exceeding standard design velocity limits for 6" IPS PVC pipe in primary distribution service. The governing pre-specification requirement at the 401-626 is therefore not confirmation that the full primary main flow transitions through the 6" branch — it does not — but explicit confirmation that the downstream 6" branch assembly's design service flow, confirmed from the secondary distribution system's demand analysis or zone supply hydraulic design, produces a downstream 6" branch velocity within standard design limits for 6" IPS PVC pipe under the branch's peak service conditions while the 10" primary run continues to carry the remaining primary distribution flow downstream at standard design velocities. The 401-626 occupies a distinct hydraulic position in the documented Spears 401 series: above the infrastructure transition boundary of the 401-628 — whose 8" branch at 80% approaches the near-equal primary infrastructure character where full-flow inline transition approaches viability — and well above the intermediate-lateral position of the 401-624 at 40% and the appurtenance-scale positions of the 401-623 and smaller configurations, where the branch flow fraction is a small-to-moderate fraction of the primary run's throughput.

The 401-626's position in the complete documented Spears 401 series at the 10" run level — now a seven-configuration documented series comprising the 401-100 (100%), 401-628 (80%), 401-626 (60%), 401-624 (40%), 401-623 (30%), 401-622 (25%), and 401-621 (20%) — establishes the 401-626 as the large-secondary-distribution configuration that fills the most commercially significant undocumented gap between the 401-628's near-equal primary infrastructure character at 80% and the 401-624's intermediate-lateral secondary distribution character at 40%. The gap between the 401-628 and the 401-624 in the prior five-configuration documented series — spanning from 80% directly to 40% with no intermediate configuration — represented the largest undocumented range in the complete Spears 401 series at the 10" run level, and the 401-626 fills this gap at the 60% position where the 6" IPS branch size's commercial character is most prominently defined by large secondary distribution header supply, major zone supply systems, large-capacity fire protection distribution main branches, large campus primary distribution system supply branches, and substantial large-appurtenance assemblies requiring larger flow capacity than the 4" intermediate-lateral configurations can provide while not requiring the near-equal 8" primary infrastructure capacity of the 401-628. In a complete 10" Schedule 40 PVC primary main BOM, all seven documented configurations may appear simultaneously at different branch locations — the 401-100 at equal flow division locations, the 401-628 at near-equal secondary primary infrastructure branches, the 401-626 at large secondary distribution header supply and major zone supply branches in 6" socket PVC construction, the 401-624 at secondary distribution header and large-capacity appurtenance branches in 4" socket PVC construction, the 401-623 at large-bore appurtenance and zone supply branches in 3" socket PVC construction, the 401-622 at fire protection supply lateral and 2-1/2" appurtenance branches, and the 401-621 at the majority of zone supply, instrument supply, chemical injection, drain, blowoff, and appurtenance branches in 2" IPS socket PVC construction. The 401-626 is most commonly specified alongside the 401-624 and 401-621 in large commercial irrigation primary transmission main and municipal distribution primary main BOMs where the appurtenance and secondary distribution supply schedule includes both 6" IPS socket PVC large secondary distribution header connections and major zone supply branches alongside the 4", 3", and 2" socket PVC intermediate-lateral and appurtenance branch connections that populate the majority of branch locations along the primary run route.

The 6" IPS branch socket's downstream application range defines the 401-626's commercial identity most precisely — larger in absolute flow capacity and downstream system scale than all configurations below it in the documented Spears 401 series at the 10" run level, but smaller in primary infrastructure scope than the 401-628's near-equal 8" branch above it. At 6" IPS socket PVC construction, the downstream branch systems and assemblies served by the 401-626's perpendicular branch socket include: 6" IPS socket PVC large secondary distribution headers where the 10" primary main supplies a 6" IPS secondary distribution main serving a major service district, large residential sector, commercial district supply zone, or institutional campus distribution system whose total peak supply demand has been hydraulically confirmed at 6" IPS from the distribution system's demand analysis — the most commercially prominent application of the 401-626, where the 6" secondary distribution header receives a substantial but sub-primary fraction of the 10" primary main's total supply capacity and distributes it within the served area while the 10" primary run continues downstream to supply additional distribution zones and service areas; 6" IPS socket PVC major zone supply header assemblies where a large commercial campus, major industrial facility, large institutional complex, or large-acreage agricultural sector connects perpendicularly to the 10" primary main through a 6" IPS socket PVC zone supply valve and header assembly — larger in flow demand than the 4" zone supply assemblies of the 401-624 and substantially larger than the 3" and smaller zone supply assemblies of the 401-623 and adjacent smaller configurations, reflecting major sector-level supply demands rather than individual service zone demands; 6" IPS socket PVC large-capacity fire protection distribution mains where a major campus fire protection grid supply main, a large commercial or institutional district fire protection distribution system, or a major facility fire protection header connects perpendicularly to the 10" primary supply main through the 401-626's branch socket while the 10" primary supply main continues downstream — applications where the fire protection distribution system's design fire flow demand has been hydraulically sized at 6" IPS supply capacity from the fire protection system engineer's demand analysis, serving larger and more complex fire protection distribution systems than the 4" fire protection supply branches of the 401-624 and substantially larger than the 2-1/2" fire protection supply lateral branches of the 401-622; 6" IPS socket PVC large campus primary distribution system supply branches where a major campus, resort, large institutional facility, or large commercial complex receives its primary distribution system supply from the 10" transmission main through a 6" IPS socket PVC perpendicular branch connection at the campus supply entry point — the campus receiving a large secondary distribution flow fraction from the 10" transmission main through the tee's 6" branch socket and distributing it through the campus primary distribution system while the 10" primary transmission main continues beyond the campus supply connection to serve additional downstream service areas; 6" IPS socket PVC large-capacity irrigation sector supply headers and primary sector distribution main connections where large agricultural field blocks, major golf course irrigation sectors, or large-acreage resort landscape irrigation sectors connect perpendicularly to the 10" primary irrigation transmission main through 6" IPS socket PVC sector supply headers and primary sector distribution mains whose total peak irrigation demand has been confirmed at 6" IPS supply capacity from the irrigation system hydraulic design; 6" IPS socket PVC major drain assembly structures where the 10" primary main requires large-capacity perpendicular drain connections in 6" IPS socket PVC construction at major drain structure locations providing substantially higher drain flow capacity than the 4" and smaller drain assemblies of the adjacent smaller configurations; 6" IPS socket PVC major blowoff assembly discharge pipes and structures at large primary main blowoff stations whose discharge capacity requirement has been confirmed at 6" IPS from the blowoff system design; large secondary pump suction supply and discharge return assemblies in 6" IPS socket PVC construction where large secondary pump units with 6" IPS socket PVC suction or discharge connections receive primary main supply or return primary main flow through the 401-626's perpendicular branch socket; 6" IPS socket PVC large-capacity chemical injection supply main connections where high-volume chemical supply mains supply treatment chemicals through 6" IPS socket PVC construction to the primary main system from a major chemical injection station whose supply main has been sized at 6" IPS; and 6" IPS socket PVC major flushing and commissioning assembly connections at large-capacity unidirectional flushing program station locations and major dead-end distribution boundary flushing stations. This complete range of 6" IPS socket PVC downstream application types — spanning large secondary distribution, major zone supply, large-capacity fire protection distribution, large campus supply, major irrigation sector supply, large drain and blowoff, large pump connections, and major chemical injection supply — is substantially broader in flow capacity and downstream system scale than any configuration below the 401-626 in the documented Spears 401 series at the 10" run level, and reflects the 6" IPS pipe size's commercial position as the entry-level primary distribution main size in the municipal and commercial PVC pipe market and the most commercially active large secondary distribution pipe size in primary main supply applications.

The three most important specification comparisons at the 401-626 are each governed by a distinct selection criterion and must each be resolved before any fitting is purchased at a 10" primary main branch location requiring a 6" large secondary distribution, major zone supply, or large fire protection supply branch assembly. The first and most important comparison is the all-socket branch versus FPT branch selection between the 401-626 and the 402-626 (10"x10"x6" Schedule 40 FPT branch tee in the Spears 402 series). The 401-626's 6" branch socket is a slip socket that accepts 6" IPS socket PVC pipe in a permanently bonded solvent cement connection — correct wherever the 6" downstream branch assembly continues in socket PVC pipe and fitting construction from the tee's branch socket. The 402-626's 6" branch port is a female pipe thread (FPT) that accepts 6" male NPT threaded components directly — correct wherever the first downstream component at the branch is an inherently 6" male NPT threaded valve body, pump connection, or large appurtenance component. This selection is determined entirely by the downstream 6" branch component's connection interface type — confirmed by inspecting the downstream component's manufacturer specification before purchasing either fitting. At the 6" branch size, the commercial distribution between socket PVC pipe continuations and male NPT threaded component connections is substantially asymmetric toward socket PVC: the dominant application categories at the 6" branch size — secondary distribution headers, large zone supply header continuations, large fire protection distribution mains, large campus supply branches, and large irrigation sector supply headers — all continue in socket PVC pipe construction from the tee's branch socket rather than threading a male NPT component directly into the branch port; 6" male NPT threaded connections are less common in the downstream assembly market at the primary main secondary distribution branch scale than at the 2", 3", and 4" branch sizes where threaded valve bodies, instrument connections, and small-to-medium appurtenance assemblies with male NPT connections are widely distributed. The socket-versus-FPT confirmation at 6" is therefore less commercially ambiguous than at the smaller branch sizes, with the 401-626's socket branch being the predominant correct specification at secondary distribution and fire protection supply branch locations — but the confirmation must still be made from the downstream component's manufacturer specification before purchasing either fitting because 6" male NPT threaded large valve bodies, pump flange adapter assemblies, and large threaded appurtenance connections are present in the commercial market and require the 402-626.

The second critical comparison is the perpendicular reducing tee versus inline reducer coupling selection between the 401-626 and the 829-626 (10"x6" Schedule 80 PVC reducer coupling in the Spears 829 series). The 401-626 is a three-port perpendicular reducing tee with two 10" run sockets and one 6" perpendicular branch socket — the 10" primary run continues at full diameter through both run ports downstream of the 6" branch connection, and the 6" branch exits at 90 degrees to the run axis. The 829-626 is a two-port inline reducer coupling with a 10" large-end socket and a 6" small-end socket — there is no continuing 10" run port, the entire primary main flow path transitions inline from the 10" socket to the 6" socket at the coupling body at approximately 2.78 times the upstream velocity, and the fitting serves inline infrastructure-to-infrastructure transition, large-capacity terminal-service, and secondary distribution terminal supply applications where the 10" primary main terminates at the fitting. The selection between the 401-626 and the 829-626 is the most commercially consequential fitting type decision at every 10" primary main location requiring a 6" connection, and is determined by the primary main continuation requirement — the single most important structural question: does the 10" primary main continue downstream of the 6" connection point? Where yes, the 401-626 is correct and the 829-626 cannot be substituted. Where no — where the primary main terminates at the 6" connection — the 829-626 is correct and the 401-626's continuing run ports serve no structural function. The 401-626 is additionally Schedule 40 white PVC while the 829-626 is Schedule 80 gray PVC — where the primary main system standard mandates Schedule 80 gray PVC throughout, the 401-626's Schedule 40 construction is not the correct material class, and the Schedule 80 counterpart tee configuration or the 829-626 reducer coupling is the correct specification. Both the structural role distinction and the schedule distinction are absolute and apply simultaneously at the fitting selection decision point.

The third critical comparison is the branch size selection within the Spears 401 series at the 10" run — between the 401-626 (6" at 60%), the 401-628 (8" at 80%) immediately above it, and the 401-624 (4" at 40%) immediately below it as the three closest documented configurations in the series at the 6" branch position. The selection between the 401-626 and the 401-628 is governed by the downstream branch system's required IPS supply capacity and infrastructure scale — the 401-628 is correct where the downstream branch system is a near-equal primary infrastructure parallel distribution system requiring 8" IPS socket PVC supply capacity and carrying a near-primary flow fraction; the 401-626 is correct where the downstream branch system is a large secondary distribution header, major zone supply header, or large-capacity fire protection distribution main requiring 6" IPS socket PVC supply capacity confirmed from the hydraulic demand analysis. The selection between the 401-626 and the 401-624 is governed by the same downstream supply capacity confirmation — the 401-626 is correct where the downstream assembly requires 6" IPS socket PVC supply capacity; the 401-624 is correct where the downstream assembly requires 4" IPS socket PVC supply capacity. At applications where the hydraulic demand analysis produces a required pipe diameter between 4" and 6" — requiring round-up to the next standard nominal IPS size satisfying the design demand within velocity limits — the correct configuration is determined by whether the round-up is to 4" IPS (401-624) or 6" IPS (401-626). At large commercial primary main projects where both 6" and 4" secondary distribution and zone supply branches appear in the same BOM at different branch locations, the 401-626 and 401-624 will both appear in the appurtenance schedule with the correct configuration at each location determined by the individual branch's confirmed downstream demand size.

The 401-626's hydraulic behavior at the 60% branch-to-run ratio and ~2.78x velocity increase at constant flow is materially different from both the near-equal 80% configuration above it and the intermediate-lateral 40% configuration below it, and this hydraulic character must be explicitly addressed in the branch service hydraulic analysis at every 401-626 installation. The 6" branch's 60% size ratio relative to the 10" run produces a tee junction hydraulic interaction that is more significant than at the 401-624 and smaller configurations — the 6" branch withdraws a meaningful large fraction of the primary run's available pressure and flow at the tee junction under peak branch service conditions, and the combined primary run and branch flow division at the 401-626 junction must be explicitly modeled in the primary system's hydraulic analysis at peak branch service event conditions. At secondary distribution header peak demand events — where the 6" secondary distribution header supplies its entire served service area at design peak demand simultaneously — the primary run's available pressure at the 401-626 tee body must supply both the 6" branch's design demand at the minimum required pressure at the branch socket and the 10" primary run's continuing downstream demand at the minimum residual pressure at the most remote downstream service point. At large fire protection demand events where the 6" fire protection distribution main's design fire flow is demanded simultaneously with the primary distribution system's domestic supply requirements, the hydraulic analysis must confirm the most demanding simultaneous service condition. The branch junction pressure loss at the 401-626 under peak 6" branch service conditions is larger in absolute magnitude than at any configuration below it in the documented series at the same operating conditions and must be included as a hydraulically material term in the primary system's hydraulic model rather than treated as negligible. In primary main systems with multiple 401-626 tee bodies at different large secondary distribution supply and major zone supply branch locations along the same primary main route — a configuration that appears in large commercial irrigation primary transmission main systems and large municipal distribution primary main systems with multiple major zone supply connections — the cumulative effect of all tee junction pressure losses on the primary run's pressure profile must be confirmed in the complete primary system hydraulic analysis to establish that the primary run's available pressure at every downstream branch location satisfies minimum supply requirements under the most demanding simultaneous service event combination.

The assembly requirements at the 401-626 reflect the size differential between its two 10" run sockets and its single 6" branch socket — a size differential that is more moderate than at the 401-624 and smaller branch configurations but remains pronounced relative to the near-equal 401-628 whose 8" branch socket approaches the 10" run socket size more closely. Both 10" run socket connections require the full large-diameter Schedule 40 PVC assembly discipline established at every 10" Schedule 40 socket fitting in this catalog — pre-planned assembly with both 10" run pipe ends fully positioned before any cement application begins, complete circumferential heavy-body cement coverage at both 10" bonding surfaces within the available working time, and full cure time compliance before any system pressurization. The 6" branch socket requires heavy-body solvent cement rated for 6" IPS Schedule 40 or Schedule 80 PVC pipe — a substantially smaller bonding surface than either 10" run socket, with correspondingly shorter working time and lower cement volume requirements at the branch socket relative to both run sockets, but a bonding surface area larger than the 4", 3", 2-1/2", and 2" branch sockets of the smaller configurations in the series and requiring the assembly discipline appropriate for a large-bore 6" IPS socket PVC connection rather than the abbreviated approach applicable to small-bore branch socket assembly. The complete assembly sequence must be planned with all three pipe ends positioned and accessible before cement application begins at any socket — the branch socket's 90-degree orientation confirmed against the piping layout drawing, the secondary distribution system layout, the fire protection system layout, or the zone supply design by dry-fit before cement is applied at any of the three sockets. At the 401-626's 60% branch-to-run size differential, the 6" branch socket's clearly smaller diameter relative to both 10" run sockets is unambiguously identifiable during field assembly — the size asymmetry eliminates any ambiguity about which port is the branch — but the branch socket's 90-degree angular departure direction relative to the run axis must still be confirmed by dry-fit against the piping layout drawing before cement application because the routing direction of the downstream 6" large secondary distribution header, fire protection distribution main, or major zone supply header — toward the served distribution area, the campus supply entry, the fire protection system's distribution entry point, or the irrigation sector's supply header connection — is governed by the piping layout and the downstream system's design rather than by the fitting's visual orientation. Apply complete circumferential heavy-body cement coverage at all three socket connections within the available working time for each respective socket size, comply fully with cure time requirements before any system pressurization, and deburr and bevel all three pipe ends — both 10" run pipe ends and the 6" branch pipe end — before cementing to ensure consistent insertion depths and complete circumferential bond lines at all three socket connections.

Engineered concrete thrust block or mechanical joint restraint is required at the 401-626's perpendicular 6" branch port at buried installations — the 90-degree perpendicular branch direction change produces an unbalanced hydraulic thrust force in the branch direction proportional to the branch pipe's operating pressure and 6" IPS cross-sectional area. At the 60% branch-to-run ratio with the 6" IPS pipe cross-sectional area, the absolute thrust force at the 401-626's branch port is the largest among all documented branch-pipe-size configurations in the Spears 401 series at the 10" run level — larger than the branch port thrust forces at the 401-624 (4" branch), 401-623 (3" branch), 401-622 (2-1/2" branch), and 401-621 (2" branch) at the same operating pressure, reflecting the 6" IPS pipe's larger cross-sectional area relative to all smaller branch configurations in the series. At the 10" primary main service pressure level where the 401-626 operates, the 6" branch port's absolute thrust force requires a thrust block bearing area that must be calculated site-specifically from soil bearing conditions, operating pressure, and 6" IPS branch pipe cross-sectional area at each buried 401-626 installation location — the thrust block bearing area at the 401-626 is substantially larger than at any documented appurtenance-scale or intermediate-lateral configuration in the series at the same operating pressure and must not be assumed proportionally from the smaller branch configuration thrust block designs without explicit engineering recalculation. At large commercial irrigation primary transmission main and municipal water distribution primary main installations where the 401-626 is specified at large secondary distribution supply or major zone supply branch locations, the primary system engineer must confirm the thrust block design at each buried 401-626 branch port as a discrete engineering event — the 6" branch socket's thrust block is an infrastructure-scale civil engineering element at the primary main's operating pressure, not a minor appurtenance thrust block. No thrust restraint is required at either 10" run port — the run ports are inline connections producing no angular thrust force component in the run direction.

The schedule selection at the 401-626 — Schedule 40 over the Schedule 80 counterpart at the 10"x10"x6" all-socket reducing tee configuration — follows the engineering framework established across all 10" Schedule 40 specialty fitting pages in this catalog. Schedule 40 is the correct specification where the system's design operating pressure, surge allowance, and engineering safety margin requirements fall within the Schedule 40 pressure ceiling at the 10" fitting size, where the system specification does not mandate Schedule 80 gray PVC throughout, and where the design engineer has confirmed that Schedule 40 wall thickness satisfies all engineering requirements at the primary main large-secondary-distribution branch location. At large secondary distribution header supply and large fire protection distribution main supply branch locations where the 6" branch's design service flow and the primary main's operating pressure together define the loading at the 401-626's branch junction, the schedule confirmation must include explicit verification that the 10" primary main's full operating pressure — including surge transient — falls within the Schedule 40 pressure ceiling at the 10" reducing tee fitting size. Where the system requires Schedule 80 wall thickness, gray material class identification, or the higher pressure ceiling at the large-diameter primary main reducing tee fitting, the Schedule 80 counterpart at the 10"x10"x6" reducing tee configuration is the correct specification.

Schedule 40 white PVC construction provides the chemical resistance, NSF certification, and structural capability appropriate for large-diameter primary main large-secondary-distribution branch tee service within the Schedule 40 pressure and wall thickness envelope. PVC Type 1 Grade 1 construction with cell classification 12454 per ASTM D1784 delivers broad chemical resistance across water treatment chemicals, process water service, industrial utility water, and the full range of non-solvent process fluids appropriate for Schedule 40 PVC primary main service at all three socket connections. The white color provides the permanent, inspectable Schedule 40 material class identification at the primary main large-secondary-distribution branch location. The 6" branch socket is compatible with both Schedule 40 and Schedule 80 6" IPS PVC pipe — the schedule of the 6" downstream branch pipe is selected based on the downstream secondary distribution system's, fire protection distribution main's, or zone supply system's own design requirements rather than constrained by the 401-626's socket geometry.

NSF 61 certification lists this fitting for potable water contact, and NSF 14 covers compliance with applicable plastics piping material standards — making it the correct Schedule 40 PVC all-socket large-secondary-distribution branch tee for municipal water distribution systems, large potable water pump station primary headers, large commercial irrigation primary mains, and large commercial and institutional water supply primary mains where NSF-listed materials are required at every fitting in the primary distribution system including tee bodies at primary main large secondary distribution header supply, major zone supply, large-capacity fire protection distribution main, large campus supply, and large-capacity appurtenance branch locations. ASTM D2466 governs Schedule 40 PVC socket fittings and defines the manufacturing, dimensional, and pressure performance requirements the 401-626 is produced to. Verify manufacturer pressure rating documentation for the specific fitting configuration before final system specification — at the 10"x10"x6" reducing tee configuration, the governing pressure rating is determined by the 10" run port size and the fitting's tested performance at this large-diameter large-secondary-distribution branch tee geometry, and must be confirmed against the manufacturer's published pressure-temperature rating table for SKU 401-626 before installation in systems at or near the fitting's rated pressure ceiling.

Key Features:

• Schedule 40 white PVC reducing tee — 10" x 10" run (slip socket) x 6" branch (slip socket), all socket (slip) ends; Spears 401 series Schedule 40 PVC socket fittings
• 6" IPS socket branch — large secondary distribution headers, major zone supply systems, large-capacity fire protection distribution mains, large campus primary distribution supply branches, large irrigation sector supply headers, major drain and blowoff structures, and large pump suction and discharge connections in permanently bonded 6" IPS socket PVC construction; 6" IPS is the entry-level primary distribution main size and the most commercially active large secondary distribution pipe size in primary main supply applications
• Large-secondary-distribution position in the Spears 401 series at the 10" run — above the intermediate-lateral configurations (401-624 at 40%, 401-623 at 30%, 401-622 at 25%, 401-621 at 20%) and below the near-equal primary infrastructure configuration (401-628 at 80%); 6" branch serves large secondary distribution and major zone supply roles requiring larger flow capacity than 4" and smaller configurations can provide but not requiring the near-equal 8" primary infrastructure capacity of the 401-628
• 6" branch at 60% of 10" run diameter — ~36% cross-sectional area ratio; ~2.78x velocity increase at constant flow; full 10" primary main design flow cannot pass through 6" branch at standard primary main design velocities; 6" branch design service flow must be explicitly confirmed within 6" IPS PVC pipe velocity limits at peak branch service conditions; tee junction pressure loss at peak branch service is hydraulically material and must be included in primary system hydraulic model
• Complete Spears 401 series at the 10" run — seven-configuration documented set: 401-100 (100%), 401-628 (80%), 401-626 (60%), 401-624 (40%), 401-623 (30%), 401-622 (25%), 401-621 (20%); selection among all seven determined by downstream assembly's required IPS socket pipe size — confirm from hydraulic demand analysis, fire protection system design, or manufacturer connection specification before purchasing
• First critical comparison — all-socket versus FPT branch: 401-626 where downstream 6" branch assembly continues in socket PVC pipe and fitting construction; 402-626 (10"x10"x6" FPT branch tee) where downstream 6" branch component is inherently 6" male NPT threaded; at 6" branch size, secondary distribution header and fire protection distribution main applications predominantly use socket PVC pipe continuation — 401-626 is the predominant correct specification; large threaded valve bodies, pump flange adapters, and threaded large appurtenance assemblies with 6" male NPT interfaces use the 402-626; confirm from manufacturer specification before purchasing either fitting
• Second critical comparison — perpendicular reducing tee versus inline reducer coupling: 401-626 where 10" primary run continues downstream of the 6" branch and branch exits perpendicularly; 829-626 (10"x6" Schedule 80 PVC reducer coupling, ~2.78x velocity increase) where 10" primary main terminates inline at the 6" connection and entire end-of-run or terminal-service flow transitions inline to the 6" downstream assembly; primary main continuation requirement determines which fitting is correct; 401-626 also Schedule 40 white PVC while 829-626 is Schedule 80 gray PVC — schedule requirement applies simultaneously
• Third critical comparison — branch size selection: 401-628 (8" at 80%) where downstream is near-equal primary infrastructure system requiring 8" IPS supply capacity; 401-626 (6" at 60%) where downstream is large secondary distribution or major zone supply system requiring 6" IPS supply capacity confirmed from hydraulic demand analysis; 401-624 (4" at 40%) where downstream is secondary distribution or large appurtenance assembly requiring 4" IPS supply capacity; confirm downstream required IPS pipe size from hydraulic demand analysis before specifying
• Largest branch port thrust force among all documented appurtenance-scale, intermediate-lateral, and large-secondary-distribution configurations in Spears 401 series at the 10" run — thrust block bearing area at buried 401-626 6" branch port is an infrastructure-scale civil engineering element; must not be assumed proportionally from smaller branch configuration thrust block designs; site-specific engineering calculation required from soil bearing conditions, operating pressure, and 6" IPS branch pipe cross-sectional area; no thrust restraint required at either 10" run port
• Branch socket orientation committed at run socket cement application — 6" branch socket angular direction confirmed by dry-fit against piping layout, secondary distribution system layout, or fire protection system design before cement at any socket; the 6" branch socket's clearly smaller diameter relative to both 10" run sockets provides unambiguous field identification of the branch port; departure direction toward served secondary distribution area, campus supply entry, or fire protection system entry must be confirmed against layout drawings
• Both 10" run socket connections require full large-diameter heavy-body cement assembly discipline; 6" branch socket requires large-bore 6" IPS heavy-body cement assembly discipline — not abbreviated small-bore assembly; plan complete three-socket assembly sequence with all pipe ends positioned before cement application begins; full cure time compliance before pressurization
• 6" branch socket accepts Schedule 40 and Schedule 80 6" IPS PVC pipe — downstream branch pipe schedule selected from secondary distribution system, fire protection distribution main, or zone supply system design requirements
• Schedule 40 vs. Schedule 80 selection: Schedule 40 correct where system pressure, surge, and safety margin requirements fall within Schedule 40 pressure ceiling at the 10" reducing tee fitting size; verify against Schedule 80 counterpart and 829-626 inline reducer coupling before final specification at large-secondary-distribution branch locations
• Manufactured to ASTM D2466 — governing standard for Schedule 40 PVC socket fittings
• NSF 61 certified for potable water contact; NSF 14 listed
• Run socket connections compatible with Schedule 40 and Schedule 80 IPS 10" pipe; branch socket compatible with Schedule 40 and Schedule 80 IPS 6" pipe
• White color — standard Schedule 40 material class identification at the primary main large-secondary-distribution branch location
• Cell classification PVC 12454 per ASTM D1784
• Heavy-body solvent cement required at all three socket connections; full cure time compliance mandatory before pressurization
• Pressure rating: verify against manufacturer pressure-temperature table for SKU 401-626

Specifications:

Industries & Applications:

• Municipal Water Distribution — Primary Transmission and Distribution Main Large Secondary Distribution Header Supply Branches, Major Zone Supply Branches, Large-Capacity Fire Protection Distribution Main Branches, Major Drain and Blowoff Assembly Branches, and Large Secondary Pump Connections on 10" Schedule 40 Primary Mains — The 10" x 10" x 6" Schedule 40 all-socket reducing tee is specified at 6" IPS socket PVC branch assembly locations on 10" municipal water transmission and primary distribution mains in Schedule 40 PVC systems where the downstream branch assembly requires 6" IPS socket PVC supply capacity and the primary run must continue downstream at full 10" diameter; large secondary distribution header supply branches where the 10" primary distribution main provides perpendicular supply branches to 6" IPS secondary distribution mains serving major residential sectors, large commercial districts, or large institutional service areas whose total peak supply demand has been confirmed at 6" IPS from the distribution system's demand analysis — the primary commercial application of the 401-626 in the municipal water distribution market, where the 6" secondary distribution header receives a large but sub-primary fraction of the 10" primary main's total supply capacity and distributes it within the served district while the 10" primary main continues downstream to supply additional distribution sectors; major zone supply branches where the 10" primary distribution main provides perpendicular zone supply branches to major commercial, industrial, or institutional zones whose peak supply demands require 6" IPS socket PVC supply capacity from the hydraulic demand analysis — zones larger and more demanding in total supply than those served by the 4" and smaller branch configurations of the 401-624 and below; primary distribution main large-capacity fire protection distribution main branches where major residential district fire protection grid supply mains, large campus fire protection distribution system supply mains, and major commercial district fire protection headers in 6" IPS socket PVC construction connect perpendicularly to the 10" primary distribution main while the primary distribution main continues downstream; primary transmission main major low-point large-capacity drain assembly branches where the 10" primary transmission main requires large-capacity perpendicular drain connections in 6" IPS socket PVC construction at major drain structure locations whose drainage capacity requirement has been confirmed at 6" IPS; primary distribution main major blowoff assembly branches where the 10" primary distribution main requires large-capacity blowoff valve assemblies in 6" IPS socket PVC construction at major blowoff stations; and large secondary pump suction supply branches where large secondary pump suction supply assemblies in 6" IPS socket PVC construction connect perpendicularly to the continuing 10" primary distribution main; NSF 61 listing confirms potable water fitness at every municipal distribution primary main 6" socket branch connection; the 6" branch design service flow must be confirmed within 6" IPS PVC pipe velocity limits at peak branch service conditions; tee junction pressure loss at peak branch service is materially significant and must be included in the primary system hydraulic model; infrastructure-scale engineered thrust block design at each buried 401-626 branch port is mandatory
• Water Treatment Plant — Primary Header Large Secondary Distribution Supply Branches, Major Zone Supply Branches, Major Drain Assembly Branches, Large Chemical Dosing Supply Main Branches, and Large Equipment Supply Connections on 10" Schedule 40 Primary Distribution Headers — Installed at 6" IPS socket PVC branch assembly locations on 10" primary distribution headers in municipal and industrial water treatment plants where the primary header continues downstream — filter gallery and treatment process primary header large secondary distribution supply branches where 6" IPS socket PVC supply assemblies connect perpendicularly to the 10" primary header and supply major large-capacity filter gallery process sections, large parallel treatment train clusters, and primary large-capacity treatment zone supply systems while the primary header continues downstream at full 10" diameter; plant service water primary header large secondary distribution supply branches where 6" IPS socket PVC secondary service water distribution mains connect perpendicularly to the 10" primary service water header and distribute service water throughout major treatment facility distribution zones while the primary header continues downstream; clearwell supply and distribution header major low-point drain assembly branches where 6" IPS socket PVC large-capacity drain valve assemblies connect perpendicularly to the 10" primary header at major large-capacity drain structure branch locations; backwash supply primary header large-capacity supply branches where 6" IPS socket PVC large backwash supply assemblies connect perpendicularly to the 10" primary backwash supply header while the header continues downstream; primary distribution header large-volume chemical dosing supply main branches where major high-volume chemical supply mains in 6" IPS socket PVC construction connect perpendicularly to the 10" primary distribution header at major chemical injection station primary main connection points; primary distribution header large equipment supply branches where 6" IPS socket PVC supply assemblies connect perpendicularly to the 10" primary header and supply major large-capacity process equipment and large-capacity filter backwash supply systems; and primary distribution header large secondary pump suction and discharge branches where 6" IPS socket PVC large secondary pump suction supply and booster pump discharge assemblies connect perpendicularly to the continuing 10" primary distribution header; NSF 61 listing confirms potable water fitness at every water treatment plant primary header 6" socket branch connection
• Pump Station — Primary Header Large Secondary Distribution Supply Branches, Major Zone Supply Branches, Major Drain and Blowoff Assembly Branches, Large Chemical Injection Supply Branches, and Large Secondary Pump Connections on 10" Schedule 40 Primary Headers — Used at 6" IPS socket PVC branch assembly locations on 10" primary pump station suction and discharge headers where the primary header continues downstream — pump station primary discharge header large secondary distribution supply branches where 6" IPS socket PVC secondary distribution mains connect perpendicularly to the 10" primary discharge header and supply major service zones, large pressure districts, and downstream large-capacity distribution sectors while the discharge header continues downstream; pump station primary discharge header major blowoff assembly branches where 6" IPS socket PVC large-capacity blowoff valve assemblies connect perpendicularly to the 10" primary discharge header at major blowoff branch stations while the header continues downstream; pump station primary suction and discharge header major drain assembly branches where 6" IPS socket PVC large-capacity drain valve assemblies connect perpendicularly to the 10" primary headers at major drain structure branch locations while the headers continue downstream; pump station primary discharge header large chemical injection supply main branches where major chemical dosing supply mains in 6" IPS socket PVC construction connect perpendicularly to the 10" primary discharge header at primary chemical injection station connection points; pump station primary discharge header large fire protection distribution main branches where 6" IPS socket PVC fire protection distribution mains for the pump station facility's primary fire protection grid supply systems connect perpendicularly to the 10" primary service water header; and large secondary and standby pump suction supply branches where 6" IPS socket PVC large secondary pump suction supply assemblies connect perpendicularly to the continuing 10" primary suction header; at pump stations where primary headers operate at full system pressure including shut-off head and surge, Schedule 40 pressure ceiling confirmation at the 401-626 installation location is required before Schedule 40 material class is finalized
• Large Commercial & Agricultural Irrigation — Primary Transmission Main Large Secondary Distribution Supply Branches, Major Sector Supply Branches, Large Fire Protection Distribution Main Branches, Major Drain and Blowoff Assembly Branches, and Large Chemical Injection Supply Branches on 10" Schedule 40 Primary Mains — Specified at 6" IPS socket PVC branch assembly locations on 10" primary irrigation transmission mains at major golf course and resort irrigation systems, large-acreage agricultural operations, and regional landscape irrigation projects — the 401-626 is specified at primary transmission main branch locations where the downstream branch assembly requires 6" IPS socket PVC supply capacity, most prominently at major sector supply branches where the primary transmission main's hydraulic design has established 6" IPS as the required downstream sector supply pipe size; major sector supply branches where 6" IPS socket PVC sector supply headers connect perpendicularly to the 10" primary transmission main and supply large golf course major irrigation sectors, large-acreage agricultural field major distribution zones, or major resort landscape irrigation sectors whose total peak supply demands have been hydraulically confirmed at 6" IPS while the primary transmission main continues downstream to additional sector supply branch locations — at large commercial irrigation primary transmission main systems with multiple major sector supply branches, the 401-626 and 401-624 will both appear in the same BOM at different sector supply branch locations with the confirmed downstream demand size determining the correct configuration at each location; resort campus and large institutional campus fire protection distribution main branches where 6" IPS socket PVC campus fire protection distribution mains connect perpendicularly to the 10" primary transmission main while the primary transmission main continues downstream; irrigation pump station primary discharge main large secondary distribution supply branches where 6" IPS socket PVC large secondary distribution mains connect perpendicularly to the 10" primary discharge main and supply major transmission zones and large sector distribution systems while the primary discharge main continues downstream; irrigation primary transmission main major low-point large-capacity drain assembly branches where 6" IPS socket PVC large-capacity drain valve assemblies connect perpendicularly to the 10" primary transmission main at major drain structure branch locations while the primary transmission main continues downstream; irrigation primary transmission main major blowoff assembly branches where 6" IPS socket PVC large-capacity blowoff valve assemblies connect perpendicularly to the 10" primary transmission main at major blowoff station branch locations; and irrigation pump station primary discharge main large chemical injection supply main branches where major fertilizer injection supply mains, large-volume soil amendment chemical supply mains, and large-capacity chemical injection supply assemblies in 6" IPS socket PVC construction connect perpendicularly to the 10" primary discharge main through the 401-626's branch socket
• Industrial Process Piping — Primary Header Large Secondary Distribution Supply Branches, Major Zone Supply Branches, Major Drain and Blowoff Assembly Branches, Large Chemical Treatment Supply Mains, and Large Secondary Equipment Supply Connections on 10" Schedule 40 Primary Headers — Used at 6" IPS socket PVC branch assembly locations on 10" process water primary headers, cooling water primary distribution trunks, and plant utility water primary mains in manufacturing plants, chemical processing facilities, petrochemical support facilities, and heavy industrial environments where the downstream branch assembly requires 6" IPS socket PVC supply capacity and the primary header continues downstream — process water primary header large secondary distribution supply branches where 6" IPS socket PVC secondary process water distribution mains connect perpendicularly to the 10" primary process water header and supply major large-capacity process sections, large-capacity production unit supply zones, and major parallel large-capacity process supply branches while the primary header continues downstream; cooling water primary distribution trunk major large-capacity zone supply and equipment supply branches where 6" IPS socket PVC large-capacity cooling water zone supply assemblies connect perpendicularly to the 10" primary cooling water trunk and supply major heat exchanger bank clusters, large-capacity cooling equipment complexes, and major process section cooling supply systems while the primary trunk continues downstream; plant utility water primary main major drain assembly branches where 6" IPS socket PVC large-capacity drain valve assemblies connect perpendicularly to the 10" primary utility water main at major drain structure branch locations; plant process water primary header large chemical treatment supply main branches where major large-volume corrosion inhibitor supply mains, high-volume biocide injection supply mains, and large-capacity scale inhibitor supply connections in 6" IPS socket PVC construction connect perpendicularly to the 10" primary process water header at primary chemical treatment supply connection points; facility fire protection distribution main branches where 6" IPS socket PVC industrial facility fire protection distribution mains connect perpendicularly to the 10" primary service water main through the 401-626's branch socket at plant fire protection grid primary supply connection points; and large secondary and standby process pump suction supply branches where 6" IPS socket PVC large secondary pump suction supply assemblies connect perpendicularly to the continuing 10" primary process water header; Schedule 40 white PVC construction satisfies the material specification at primary process header 6" socket large-secondary-distribution branch locations where Schedule 40 is the system material standard
• Municipal Well Field — Primary Collection and Distribution Header Large Secondary Distribution Supply Branches, Major Zone Supply Branches, Major Drain and Blowoff Assembly Branches, Large Chemical Injection Supply Branches, and Large Secondary Pump Connections on 10" Schedule 40 Primary Headers — Installed at 6" IPS socket PVC branch assembly locations on 10" primary well field collection and distribution headers where the primary header continues downstream — primary distribution header large secondary distribution supply branches where 6" IPS socket PVC secondary distribution mains connect perpendicularly to the 10" primary distribution header and supply major service zones, large-capacity pressure districts, and major sector transmission systems while the primary header continues downstream at full 10" diameter; primary distribution header major zone supply branches where 6" IPS socket PVC large zone supply valve assemblies and supply main connections connect perpendicularly to the 10" primary distribution header at major large-capacity zone supply branch locations; pump station primary discharge header major blowoff assembly branches where 6" IPS socket PVC large-capacity blowoff valve assemblies connect perpendicularly to the 10" primary discharge header at major blowoff stations; pump station primary discharge header large water treatment chemical injection supply main branches where major large-volume chlorination supply mains, fluoridation supply mains, pH adjustment chemical supply mains, and high-volume corrosion inhibitor supply connections in 6" IPS socket PVC construction connect perpendicularly to the 10" primary distribution header; primary collection and distribution header major drain assembly branches where 6" IPS socket PVC large-capacity drain valve assemblies connect perpendicularly to the 10" primary header at major drain structure branch locations; and large secondary pump suction supply branches where 6" IPS socket PVC large secondary and standby pump suction supply assemblies connect perpendicularly to the continuing 10" primary distribution header through the 401-626's branch socket
• Water & Wastewater Treatment — Primary Process Header Large Secondary Distribution Supply Branches, Major Zone Supply Branches, Major Drain and Blowoff Assembly Branches, Large Chemical Dosing Supply Mains, and Major Process Equipment Supply Connections on 10" Schedule 40 Primary Process Headers — Specified at 6" IPS socket PVC branch assembly locations on 10" primary process distribution headers in industrial wastewater treatment, water reclamation, and large-scale industrial water management facilities where the primary process header continues downstream — primary influent header major large-capacity zone supply branches where 6" IPS socket PVC supply assemblies connect perpendicularly to the 10" primary influent header and supply large-capacity treatment train clusters, major parallel large-capacity process unit groups, and primary large-capacity treatment zone supply systems while the primary header continues downstream; primary effluent distribution header large secondary distribution supply branches where 6" IPS socket PVC secondary effluent distribution mains connect perpendicularly to the 10" primary effluent header and supply major large-capacity reclaimed water use zones, large-capacity downstream treatment connections, and major effluent distribution sectors while the primary header continues downstream; primary process distribution header major drain and blowoff assembly branches where 6" IPS socket PVC large-capacity drain valve and blowoff assemblies connect perpendicularly to the 10" primary process header at major drain and blowoff structure branch locations; primary chemical distribution header large-volume dosing supply main branches where major high-volume chemical supply mains in 6" IPS socket PVC construction connect perpendicularly to the 10" primary chemical distribution header at major chemical station primary connection points; aeration system primary supply header large-capacity zone supply branches where 6" IPS socket PVC large-capacity aeration supply assemblies connect perpendicularly to the 10" primary aeration supply header and supply major large-capacity aeration zone clusters while the primary header continues downstream; and primary process distribution header major equipment supply and large secondary pump connection branches where 6" IPS socket PVC large process equipment supply assemblies and major secondary pump suction and discharge connections connect perpendicularly to the 10" primary header; NSF 61 listing confirms fitness for every 6" socket branch connection in the primary treatment distribution system
• HVAC & Large Commercial Mechanical Systems — Primary Distribution Main Large Secondary Distribution Supply Branches, Major Zone Supply Branches, Major Drain Assembly Branches, Large Chemical Treatment Supply Mains, and Large Secondary Pump Connections on 10" Schedule 40 Primary Distribution Mains — Used at 6" IPS socket PVC branch assembly locations on 10" primary chilled water distribution mains, condenser water primary trunks, and large-capacity hydronic heating and cooling primary distribution mains in Schedule 40 PVC systems at large commercial campus, institutional, and industrial mechanical systems where the downstream branch assembly requires 6" IPS socket PVC supply capacity — campus primary chilled water distribution main major large-capacity secondary distribution supply branches where 6" IPS socket PVC secondary chilled water distribution mains connect perpendicularly to the 10" primary chilled water distribution main and supply major campus building clusters, large institutional building chilled water distribution systems, and campus sector mechanical room supply distributions whose total peak supply demands have been hydraulically confirmed at 6" IPS from the campus chilled water distribution system's demand analysis while the primary distribution main continues downstream; primary condenser water distribution trunk major large-capacity zone supply and equipment supply branches where 6" IPS socket PVC large-capacity condenser water zone supply assemblies connect perpendicularly to the 10" primary condenser water trunk and supply major cooling tower circuit groups, large-capacity condenser water equipment clusters, and parallel large-capacity condenser water supply systems while the primary trunk continues downstream; campus primary distribution main large fire protection distribution main branches where 6" IPS socket PVC campus fire protection distribution mains for major campus building cluster fire protection grids connect perpendicularly to the 10" campus primary supply distribution main while the primary distribution main continues downstream; primary distribution main major drain assembly branches where 6" IPS socket PVC large-capacity drain valve assemblies connect perpendicularly to the 10" primary distribution main at major drain structure branch locations; primary distribution main large chemical treatment supply main branches where large-volume cooling tower treatment chemical supply mains, chilled water corrosion inhibitor supply mains, and large-capacity glycol supply connections in 6" IPS socket PVC construction connect perpendicularly to the 10" primary distribution main at primary chemical supply connection points; and large-capacity secondary and supplemental circulation pump suction supply branches where 6" IPS socket PVC large secondary pump suction supply assemblies connect perpendicularly to the continuing 10" primary distribution main
• Aquaculture & Large-Scale Water Management Infrastructure — Installed at 6" IPS socket PVC branch assembly locations on 10" primary water supply, recirculation, or distribution mains at the largest commercial aquaculture facilities, regional hatchery systems, and large recirculating aquaculture systems (RAS) where the downstream branch assembly requires 6" IPS socket PVC supply capacity and the primary main continues downstream — primary recirculation main major large-capacity secondary distribution supply branches where 6" IPS socket PVC secondary recirculation distribution mains connect perpendicularly to the 10" primary recirculation main and supply major large-capacity production hall recirculation zones, large-capacity tank system clusters, and primary treatment train supply assemblies whose total recirculation supply demands have been confirmed at 6" IPS while the primary recirculation main continues downstream; primary supply main major large-capacity zone supply and secondary distribution branches where 6" IPS socket PVC major zone supply headers connect perpendicularly to the 10" primary supply main and supply major aquaculture production sectors, large hatchery incubation hall supply systems, and large-capacity indoor production area supply distributions while the primary supply main continues downstream; facility fire protection distribution main branches where 6" IPS socket PVC aquaculture facility fire protection distribution mains connect perpendicularly to the 10" primary supply distribution main at facility fire protection grid primary supply connection points; primary supply main major chemical treatment supply main branches where large-volume water quality treatment chemical supply mains in 6" IPS socket PVC construction connect perpendicularly to the 10" primary supply main at major chemical treatment station connection points; primary recirculation main large secondary pump suction and discharge branches where large secondary recirculation pump suction supply assemblies and booster pump discharge assemblies in 6" IPS socket PVC construction connect perpendicularly to the continuing 10" primary recirculation main through the 401-626's branch socket; primary supply main major drain assembly branches where 6" IPS socket PVC large-capacity drain valve assemblies connect perpendicularly to the 10" primary supply main at major drain structure branch locations; NSF 61 listing confirms fitness for every 6" socket branch connection in the primary aquaculture distribution system