Wye, Slip x Slip x Slip 3" x 3" x 2-1/2" (9875-339)

The 3" x 2-1/2" Schedule 40 White PVC Reducing Wye (9875-339, Slip x Slip x Slip) is a medium-bore thermoplastic reducing branch junction fitting manufactured to ASTM D2466 in Schedule 40 white PVC — a three-port fitting in which both run connections are 3" IPS slip socket ends and the branch connection is a 2-1/2" IPS slip socket end exiting at 45 degrees to the run axis, providing a single-body Schedule 40 PVC solution for connecting a 2-1/2" IPS socket PVC branch assembly to a 3" Schedule 40 PVC primary run at a branch junction location where the 3" primary run continues at full diameter through both straight-run ports downstream of the 2-1/2" branch connection and the 2-1/2" branch exits at 45 degrees to the run axis rather than at the 90-degree perpendicular angle of a standard reducing tee, without a saddle tap, without field fabrication, without transitioning out of Schedule 40 white PVC construction at the branch junction, and without the higher hydraulic minor loss at the branch junction that the 90-degree perpendicular branch geometry of the reducing tee produces at the same nominal size combination. The 9875-339 is the correct fitting wherever a 3" Schedule 40 PVC primary run must provide a 2-1/2" IPS socket PVC branch connection while maintaining the full 3" primary run diameter through both run sockets — where the 2-1/2" downstream branch assembly is permanently bonded socket PVC construction continuing in 2-1/2" IPS socket PVC pipe and fittings from the wye's branch socket, where the primary run must continue downstream of the 2-1/2" branch at full 3" diameter, where the branch connection must be a manufactured, rated, NSF-listed, ASTM D2466-compliant Schedule 40 white PVC wye body with a 45-degree branch socket whose 2-1/2" slip socket accepts standard 2-1/2" IPS Schedule 40 or Schedule 80 PVC pipe directly, and where the 45-degree branch angle provides a hydraulic, geometric, or gravity-flow advantage over the 90-degree perpendicular branch angle of the Spears 401 series reducing tee at the same 3"x2-1/2" size combination. The 9875-339 is the near-equal-branch reducing wye of the 3" Schedule 40 PVC socket fitting ecosystem — occupying the near-equal-branch anchor position at the 3" run service level with the highest branch-to-run diameter ratio and the lowest velocity increase of any reducing wye documented in this catalog across both the 3" and 4" run service levels, with the 2-1/2" branch socket at approximately 83% of the 3" run diameter producing a cross-sectional area ratio of approximately 69% and a velocity increase of approximately 1.44x at constant full-branch-flow passage through the wye body's branch socket.

The 9875-339's commercial identity is defined by the same two characteristics that define the 9875-422 and 9875-420 at the 4" run service level — the three-port branch junction role with a continuing 3" run, and the 45-degree branch angle — but with a near-equal branch character at the 3" run service level that is more pronounced than at any other reducing wye documented in this catalog, established by the 2-1/2" IPS branch size's 83% branch-to-run ratio and the ~1.44x velocity increase that approach the symmetric equal-wye branch geometry more closely than any other reducing wye configuration in the documented Spears 9875 series. The 9875-339 does not reduce the run pipe size: both run sockets are 3" IPS, the primary run continues at full 3" diameter through both run ports, and no velocity increase occurs at the run ports. The 9875-339 does not transition the primary run inline from one pipe size to another: it is not a reducer coupling, and its run axis is not interrupted by a size change at the wye body. The 9875-339 does not adapt another fitting's socket: it is an independent three-port fitting body in the primary run, connected between upstream and downstream 3" IPS pipe sections with the 2-1/2" branch socket providing the 45-degree branch connection at the junction point.

The 9875-339's hydraulic character at the ~1.44x velocity increase is the defining technical parameter that establishes its near-equal-branch role and distinguishes it from every other configuration in the Spears 9875 series at the 3" run level in a manner more extreme than the corresponding distinction at the 4" run level. At approximately 69% cross-sectional area ratio — the 2-1/2" IPS pipe's cross-sectional area is approximately 69% of the 3" IPS pipe's cross-sectional area — the velocity increase at constant flow through the branch socket is approximately 1.44x. This ~1.44x velocity increase is the lowest velocity increase of any reducing wye documented in this catalog, lower even than the 9875-422's ~1.78x at the 4" run level, and places the 9875-339 at the closest approach to equal-branch geometry among all reducing wye configurations in the documented Spears 9875 series. At a standard 3" primary run design velocity of 3 feet per second, the 2-1/2" downstream branch velocity at the confirmed branch design service flow fraction that produces full run velocity passage through the branch would be approximately 4.3 feet per second — well within standard design velocity limits for 2-1/2" IPS PVC pipe in lateral supply service. At a standard 3" primary run design velocity of 4 feet per second, the corresponding 2-1/2" downstream branch velocity at full-run-velocity-equivalent branch flow would be approximately 5.8 feet per second — within the acceptable range for 2-1/2" IPS PVC pipe in lateral supply service at most commercial design standards, though confirmation against the downstream 2-1/2" secondary assembly's specific design velocity limit remains the governing pre-specification step. At a 3" primary run design velocity of 5 feet per second, the corresponding branch velocity at full-run-velocity-equivalent branch flow would be approximately 7.2 feet per second — approaching the upper end of standard design velocity limits for 2-1/2" IPS PVC pipe in lateral supply service, requiring explicit confirmation that the downstream 2-1/2" secondary assembly's design accepts this velocity or that the branch flow fraction is confirmed below the full-run-velocity-equivalent level.

The governing pre-specification requirement at the 9875-339 is the same explicit branch velocity confirmation established across all branch junction fitting documentation in this catalog: confirm that the downstream 2-1/2" branch assembly's confirmed design service flow — the peak demand of the downstream irrigation zone header, the confirmed pump suction or discharge branch flow, the confirmed drainage lateral flow, or the confirmed process equipment supply demand — produces a downstream 2-1/2" branch velocity within standard design limits for 2-1/2" IPS PVC pipe under the branch's peak service conditions. The 3" primary run continues to carry the remaining primary run flow at its design velocity through both run sockets downstream of the 9875-339 branch junction, and the branch's confirmed design service flow is a fraction of the total 3" primary run flow at the branch junction location. The near-equal character of the 9875-339's ~1.44x branch velocity increase means that at lower primary run design velocities, the downstream 2-1/2" branch assembly can carry a meaningful fraction of the 3" primary run's total flow without exceeding 2-1/2" IPS design velocity limits — more of the primary run's total throughput can be diverted through the 2-1/2" branch at any given primary run design velocity at the 9875-339 than at the 9875-422, reflecting the 9875-339's more pronounced near-equal branch geometry.

The 9875-339's position within the Spears 9875 series at the 3" run level requires treatment of the complete documented reducing wye series at the 3" run service level. At the 3" run level, the documented Spears 9875 series includes reducing configurations at multiple branch sizes below the equal 3"x3"x3" wye, with the 9875-339 establishing the near-equal-branch anchor at the largest documented branch-to-run ratio in the series at the 3" run level. Below the 9875-339 in the reducing wye series at the 3" run level, progressively smaller branch sizes with higher velocity increases serve the standard-lateral and appurtenance-scale roles at the 3" run service level — where the smaller branch socket size and higher velocity increase characterize branch assemblies carrying smaller fractions of the primary run's total flow in zone supply valve, drain, chemical injection, and appurtenance branch service rather than the near-equal large lateral supply role the 9875-339's 2-1/2" branch serves. The selection between the 9875-339 and smaller reducing wye configurations at the 3" run level is governed by the downstream branch assembly's confirmed required IPS supply pipe size — the 9875-339 is correct where the downstream assembly requires 2-1/2" IPS socket PVC supply capacity; smaller reducing wye configurations at the 3" run level are correct where the downstream assembly requires a smaller IPS supply pipe size. In primary run BOMs where both 2-1/2" and smaller IPS branch assemblies appear at different branch locations along the same 3" primary run, both the 9875-339 and smaller 3" run reducing wye configurations will appear in the BOM at different locations — the 9875-339 at large lateral supply and large zone supply branch locations requiring 2-1/2" IPS socket PVC supply capacity, and smaller configurations at zone supply valve, drain, and appurtenance branch locations requiring smaller IPS supply pipe sizes.

The 2-1/2" IPS branch size's commercial position as a bridge between the more commonly stocked 2" and 3" IPS socket PVC pipe sizes deserves explicit characterization as context for the 9875-339's downstream application range. In the commercial irrigation, process piping, and water distribution markets, 2-1/2" IPS socket PVC pipe occupies an intermediate commercial position — less universally stocked than either 2" IPS or 3" IPS but commercially active in specific application contexts where the downstream assembly's hydraulic demand exceeds the flow capacity that 2" IPS can provide at acceptable design velocities but does not require the full 3" IPS supply capacity that the equal wye branch would provide. These specific application contexts include irrigation sub-main lateral supply assemblies where a large zone supply header or a major irrigation sector supply assembly requires 2-1/2" IPS supply capacity to serve its downstream demand at acceptable velocities; pump suction manifold branch supply entries where the pump's suction requirements specify a 2-1/2" IPS inlet connection and the suction supply is drawn from a 3" primary suction header; drainage collection lateral entries where the drainage lateral's collection flow volume requires 2-1/2" IPS pipe capacity for gravity drainage continuity at design grade; and process piping branch supply connections where the downstream process equipment's supply specification requires a 2-1/2" IPS socket PVC connection. Buyers confirming the downstream assembly's required IPS pipe size must verify from the downstream assembly manufacturer's connection specification or from the hydraulic demand analysis that 2-1/2" IPS is the correct supply pipe size before specifying the 9875-339 — because the 2-1/2" IPS pipe size's less universal commercial availability means a downstream assembly specified at 2-1/2" IPS must be confirmed as genuinely requiring the intermediate size rather than accommodating either a 2" IPS supply (if the demand is within 2" IPS velocity limits) or a 3" IPS supply (if the assembly is designed with 3" IPS socket connections). This downstream supply pipe size confirmation step is more consequential at the 9875-339's 2-1/2" branch than at either the 9875-422's 3" branch or the 9875-420's 2" branch — both of which serve more universally stocked downstream pipe sizes — because a specification error at the 2-1/2" branch size may require the buyer to source 2-1/2" IPS socket PVC pipe and fittings for the downstream assembly in a market where 2-1/2" IPS is less universally available at local plumbing and irrigation supply distributors than 2" or 3" IPS.

The most commercially important specification comparison at the 9875-339 is the wye versus reducing tee selection — the selection between the 9875-339 and the 3"x3"x2-1/2" Schedule 40 all-socket reducing tee at the same 3"x2-1/2" run-and-branch size combination. Both fittings provide a 2-1/2" IPS socket PVC branch connection on a continuing 3" IPS primary run in Schedule 40 white PVC construction. The sole functional difference is the branch exit angle: the 9875-339 exits at 45 degrees, the reducing tee exits at 90 degrees perpendicular to the run. This angular difference produces every practical consequence that distinguishes the two fittings in the field: the lower hydraulic minor loss at the 9875-339's 45-degree branch junction relative to the reducing tee's 90-degree branch; the 45-degree directional requirement for the downstream 2-1/2" branch assembly's routing away from the primary run versus the 90-degree perpendicular requirement at the tee; the differently oriented thrust block requirement at the 9875-339's buried branch port (at 45 degrees to the run versus perpendicular to the run at the tee); and the 9875-339's smooth lateral flow contribution advantage in gravity drainage collection systems where the 45-degree branch entry orients the lateral's drainage flow more aligned with the collection main's downstream direction than the 90-degree perpendicular entry of the reducing tee. The selection between the 9875-339 and the 3"x3"x2-1/2" reducing tee is governed by the same four criteria established across all wye-versus-tee comparisons in this catalog: the hydraulic minor loss budget for the primary run at the branch junction; the available routing space for the 45-degree branch departure direction versus the perpendicular departure; the gravity-flow or drainage service character; and the downstream branch assembly's preferred departure direction relative to the primary run. Where the routing space at the branch junction cannot accommodate the 9875-339's 45-degree branch footprint along the run axis — at branch locations where the available space in the run direction between the wye body and an adjacent structural element is insufficient for the 45-degree branch departure geometry — the 3"x3"x2-1/2" reducing tee may be the only geometrically viable configuration regardless of the hydraulic preference for the wye. The 45-degree branch departure direction is committed at the wye body and cannot be field-modified after cement application; buyers must confirm the downstream branch assembly's routing direction and the available space in the run-axis direction from the piping layout drawing before specifying the 9875-339 over the 3"x3"x2-1/2" reducing tee.

At the 9875-339's near-equal branch scale, the hydraulic minor loss advantage of the 45-degree wye branch over the 90-degree tee branch is more operationally significant than at the more asymmetric branch sizes of the 9875-420 — because the 2-1/2" branch at 83% of the 3" run diameter carries a larger fraction of the primary run's total flow than a 2" branch at 50%, and the absolute minor loss at the branch junction is proportionally larger relative to the primary run's total hydraulic head budget when the branch carries a near-equal flow fraction. At the 9875-339's near-equal geometry, the flow division between the continuing 3" run and the 2-1/2" branch more closely approaches the equal-flow-split character of the equal wye — where the hydraulic minor loss at the branch junction is most sensitive to the branch angle geometry and where the 45-degree wye's smoother flow division produces the greatest proportional minor loss reduction relative to the 90-degree tee. This hydraulic sensitivity makes the 9875-339 more consistently preferred over the 3"x3"x2-1/2" reducing tee at near-equal flow fraction branch locations than the more asymmetric reducing wyes are preferred over their respective tee counterparts — the near-equal branch geometry amplifies the hydraulic case for the 45-degree wye angle over the 90-degree tee at every branch location where the downstream 2-1/2" assembly carries a substantial fraction of the 3" primary run's total flow.

The 9875-339 is additionally distinguished from the 3"x3"x2-1/2" Schedule 40 FPT branch tee — which has a 2-1/2" FPT branch accepting 2-1/2" male NPT threaded components at a 90-degree perpendicular branch rather than a 2-1/2" slip socket accepting socket PVC pipe — and from any wye configuration with a 2-1/2" FPT branch rather than a 2-1/2" slip socket. The 9875-339's 2-1/2" slip branch socket is the correct specification wherever the downstream 2-1/2" branch assembly continues in permanently bonded socket PVC pipe and fitting construction from the wye's branch socket. A wye or tee configuration with a 2-1/2" FPT branch port is correct wherever the first downstream component at the branch is an inherently 2-1/2" male NPT threaded component. At the 2-1/2" branch size in the irrigation, process piping, and drainage markets, the downstream branch assembly predominantly continues in socket PVC pipe construction from the branch junction fitting — 2-1/2" IPS male NPT threaded downstream components are less universally prevalent in the commercial irrigation and distribution appurtenance market than 2" male NPT threaded components — making the 9875-339's slip branch socket the predominant correct specification at 2-1/2" IPS socket PVC branch assembly locations on 3" primary runs where the 45-degree wye angle is specified. Confirm the downstream branch component's connection interface type from the component manufacturer's specification before purchasing any branch junction fitting at a 3"x2-1/2" branch location.

The 9875-339 is further distinguished from the 3"x2-1/2" Schedule 80 PVC inline reducer coupling in the Spears 829 series and the 3"x2-1/2" Schedule 80 reducing bushing in the Spears 837 series by its three-port branch junction structural role with a continuing 3" run. The 3"x2-1/2" inline reducer coupling transitions the entire 3" primary run flow inline from the 3" large-end socket to the 2-1/2" small-end socket with no continuing 3" run downstream of the transition — a full-flow inline size reduction appropriate at terminal end-of-run and near-equal infrastructure transition locations where the primary run does not continue at 3" diameter downstream of the size change. The 9875-339 maintains the 3" primary run through both run ports and provides a 2-1/2" IPS socket PVC 45-degree branch connection at the junction — the 3" primary run continues to serve downstream distribution zones, additional branch connections, and downstream terminal assemblies beyond the 9875-339 branch junction at full 3" diameter. The structural role distinction between the 9875-339 (branch junction with continuing 3" run) and the 3"x2-1/2" inline reducer coupling (terminal inline size transition with no continuing 3" run) is the most commercially critical fitting type decision at every 3" primary run location requiring a 2-1/2" IPS socket PVC connection, determined by the single most important structural question: does the 3" primary run continue downstream of the 2-1/2" connection point at full 3" primary diameter? Where yes, the 9875-339 is correct; where no, the 3"x2-1/2" inline reducer coupling serves the terminal transition role.

The 9875-339's gravity drainage application role at the 3" collection main and 2-1/2" lateral scale parallels the gravity drainage characterization established across both the 9875-422 and 9875-420 pages — the 45-degree branch angle's smooth lateral flow contribution geometry is the universally preferred branch junction fitting type in gravity drainage collection systems at every branch size documented in the Spears 9875 series, and the 9875-339 carries this preference with amplified hydraulic significance at the near-equal 2-1/2" branch scale where the lateral's flow contribution is a larger fraction of the collection main's total flow than at the smaller branch sizes. In subsurface agricultural drainage systems, stormwater collection lateral systems, site drainage secondary collection systems, and facility drainage collection networks at the 3" collection main and 2-1/2" lateral scale, the 9875-339's 45-degree branch entry orients the 2-1/2" lateral's drainage flow contribution in a direction more aligned with the 3" collection main's downstream gravity flow direction — reducing turbulence, flow reversal, and debris accumulation risk at the lateral entry junction relative to the 90-degree perpendicular entry of the 3"x3"x2-1/2" reducing tee. At the near-equal 2-1/2" branch scale, where the lateral is contributing a large fraction of the collection main's total flow at the entry junction, this smooth flow contribution geometry is most consequential — the turbulence, flow reversal, and hydraulic disturbance that a perpendicular tee entry would create at the junction is most pronounced when the lateral contribution is a near-equal fraction of the main flow, and the 45-degree wye's geometry advantage is therefore greatest at the 9875-339's near-equal branch scale. The 9875-339 is consequently the most strongly preferred wye configuration — relative to the reducing tee at the same size — of any reducing wye configuration in the documented Spears 9875 series for gravity drainage collection applications.

In pressurized irrigation systems — the highest-volume market category for 3" primary run branch junction fittings in the Maxx-Supply commercial irrigation contractor market — the 9875-339 is specified at lateral supply branch junction locations on 3" IPS primary run supply laterals where the downstream 2-1/2" branch assembly serves a large irrigation zone supply header, a major sub-main supply connection, or a large-capacity filter station or chemical injection supply assembly requiring 2-1/2" IPS supply capacity, and where the lateral supply system's hydraulic design benefits from the lower minor loss coefficient of the 45-degree wye branch junction at the near-equal 2-1/2" branch scale. At the 9875-339's near-equal branch scale, the hydraulic minor loss reduction from the 45-degree wye over the 90-degree tee at the 2-1/2" branch junction is more consequential in the primary lateral's hydraulic head budget than at the more asymmetric smaller-branch wye configurations — because the near-equal 2-1/2" branch carries a larger absolute flow volume from the 3" primary run and produces a larger absolute minor loss at the branch junction than a smaller branch carrying only a small appurtenance-service fraction of the primary run's total flow. The 9875-339 is therefore most consistently specified over the 3"x3"x2-1/2" reducing tee at branch locations on hydraulically sensitive 3" IPS primary laterals where the downstream 2-1/2" branch assembly carries a substantial confirmed design flow fraction and the primary lateral's hydraulic analysis identifies the branch junction's minor loss as a contributing factor in the available pressure head budget.

At pump suction manifold assemblies — the application context where the wye fitting's lower suction-side minor loss coefficient provides the most operationally critical advantage — the 9875-339 is specified at 2-1/2" IPS socket PVC branch supply entries on 3" IPS primary suction manifolds where the smooth 45-degree branch entry geometry at the near-equal 2-1/2" branch scale provides the maximum suction-side minor loss reduction available in the standard 3"x2-1/2" branch junction fitting selection. At pump suction manifold assemblies where the pump's connection specification requires a 2-1/2" IPS suction inlet connection drawing supply from a 3" primary suction header, the 9875-339's 45-degree branch entry reduces the suction-side minor loss at the pump suction branch supply entry relative to the 3"x3"x2-1/2" reducing tee's 90-degree perpendicular entry — a meaningful specification advantage at suction-side branch entries where the pump's available NPSH margin is tight and the minor loss at the branch junction is hydraulically material to preserving the required NPSH above the pump's NPSH_required at the design operating point. The near-equal 2-1/2" branch scale amplifies this suction-side advantage: the 2-1/2" branch drawing near-equal supply flow from the 3" primary suction header produces a larger proportional minor loss at the branch entry than a smaller branch drawing a small appurtenance-service fraction, making the 45-degree wye's minor loss reduction most consequential at the near-equal supply branch scale that the 9875-339 represents.

The assembly requirements at the 9875-339 reflect the three socket connections — two equal 3" IPS run sockets and one 2-1/2" IPS branch socket at 45 degrees to the run axis — and the critical importance of the 45-degree branch socket's directional orientation confirmation before cement application in the same two planes established across all wye fitting pages in this catalog: the plane containing the wye's run axis and branch axis (confirming the 45-degree branch points in the correct departure direction relative to the downstream branch assembly's layout) and the rotational orientation of the wye body about the run axis (confirming the 45-degree branch socket faces the correct side of the primary run's routing plane as specified in the piping layout drawing). Both 3" run socket connections require heavy-body solvent cement rated for 3" IPS Schedule 40 or Schedule 80 PVC pipe, applied with complete circumferential coverage at both 3" bonding surfaces within the available working time. The 2-1/2" branch socket requires heavy-body solvent cement rated for 2-1/2" IPS Schedule 40 or Schedule 80 PVC pipe — a bonding surface area that is substantially similar to the 3" run socket's bonding surface at the 83% branch-to-run size ratio, more comparable to the run socket's assembly scale than any other reducing wye branch socket documented in this catalog and requiring correspondingly attentive working time management despite the slightly smaller bonding surface area relative to the 3" run sockets. The assembly sequence must be planned with all three pipe ends positioned and accessible before cement application begins at any socket — the upstream 3" run pipe end, the downstream 3" run pipe end, and the 2-1/2" branch pipe end all confirmed in position by dry-fit against the piping layout drawing before any solvent cement is applied. The 45-degree branch socket's departure direction and rotational orientation about the run axis must be confirmed by dry-fit and reference-marked before cement application, and in gravity drainage installations, the branch socket's three-dimensional orientation — departure plane, rotational orientation about the run axis, and branch invert elevation above the collection main's flow line — must be confirmed from the drainage grade plan, invert elevation calculations, and collection main alignment drawings before cement is applied at any socket. 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 or gravity-flow service, and deburr and bevel all three pipe ends before cementing to ensure consistent insertion depths and complete circumferential bond lines at all three socket connections.

The near-equal 2-1/2" branch socket's assembly scale at the 9875-339 deserves specific acknowledgment: the 9875-339's 2-1/2" branch socket is substantially larger relative to the 3" run sockets than the 2" branch socket of the 9875-420 is relative to its 4" run sockets — the 9875-339's branch socket requires working time and cement volume management more similar to the run socket scale than any other reducing wye branch socket in the documented Spears 9875 series, and the installer must treat the 2-1/2" branch socket's cement assembly with the same attentive discipline applied at the 3" run sockets rather than treating it as a small-bore auxiliary connection. Do not apply abbreviated small-bore assembly procedures at the 9875-339's 2-1/2" branch socket; apply the same complete circumferential coverage, consistent insertion depth, and full set-time management that the 3" run sockets require.

The 45-degree branch thrust force at buried 9875-339 installations follows the framework established across both wye fitting pages in this catalog: the resultant branch thrust force acts at 45 degrees to the run axis along the branch pipe axis, directed outward from the wye body in the 2-1/2" branch departure direction, with a magnitude equal to P × A_branch at the 2-1/2" IPS pipe's cross-sectional area. At the 2-1/2" IPS branch size on a 3" primary run at the 9875-339's near-equal branch scale, the absolute thrust force magnitude — P × A_branch at the 2-1/2" IPS cross-sectional area — is larger in absolute terms than at the 2" IPS branch of the 9875-420 at the same operating pressure, reflecting the 2-1/2" IPS pipe's larger cross-sectional area. The thrust block bearing surface must be oriented perpendicular to the 45-degree branch pipe axis — at 45 degrees to the trench run-axis orientation — to resist both the perpendicular-to-run and along-run thrust force components simultaneously, and undisturbed soil must be confirmed available in the 45-degree bearing direction at each buried 9875-339 installation. The thrust block bearing area is calculated from P × A_branch at the 2-1/2" IPS cross-sectional area and the full anticipated system operating pressure including surge transient at each individual buried installation location — with the near-equal 2-1/2" branch size producing a moderately larger bearing area requirement than the 2" IPS branch of the 9875-420 at the same pressure, reflecting the proportionally larger branch pipe cross-sectional area. No thrust restraint is required at either 3" run port. Thrust block construction drawings prepared by the primary system engineer are required at every buried 9875-339 installation in public water distribution systems and primary main installations regulated by the authority having jurisdiction.

The schedule selection at the 9875-339 follows the engineering framework established across all Schedule 40 specialty fitting documentation 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 3" 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 3" primary run branch location. In irrigation lateral supply, gravity drainage, and process piping branch junction applications at the 3"x2-1/2" wye size combination, Schedule 40 is the predominant correct specification for systems operating within the Schedule 40 pressure ceiling. Where the system requires Schedule 80 wall thickness, gray material class identification, or the higher pressure ceiling Schedule 80 provides — including higher-pressure pump discharge manifold assemblies, industrial process piping systems mandating Schedule 80 throughout, and applications where surge transient pressure at the 3" wye branch location exceeds the Schedule 40 pressure ceiling — the Schedule 80 counterpart at the 3"x3"x2-1/2" wye configuration is the correct specification. Schedule 40 white PVC construction provides the chemical resistance, NSF certification, and structural capability appropriate for medium-bore 3" run branch junction wye service within the Schedule 40 pressure and wall thickness envelope. The 2-1/2" branch socket is compatible with both Schedule 40 and Schedule 80 2-1/2" IPS PVC pipe — the schedule of the downstream 2-1/2" branch pipe is selected based on the downstream assembly's own design requirements and system-wide material specification standard.

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 near-equal-branch reducing wye for municipal water distribution systems, potable water treatment primary lateral assemblies, large commercial irrigation primary laterals, and commercial and institutional water supply distribution laterals where NSF-listed fittings are required at every branch junction location in the primary distribution system. ASTM D2466 governs Schedule 40 PVC socket fittings and defines the manufacturing, dimensional, and pressure performance requirements the 9875-339 is produced to. Verify manufacturer pressure rating documentation for the specific fitting configuration before final system specification — at the 3"x3"x2-1/2" wye configuration, the governing pressure rating must be confirmed against the manufacturer's published pressure-temperature rating table for SKU 9875-339 before installation in systems at or near the fitting's rated pressure ceiling.

Key Features:

• Schedule 40 white PVC reducing wye — 3" run (slip socket) x 3" run (slip socket) x 2-1/2" branch (slip socket, 45-degree exit); Spears 9875 series Schedule 40 PVC socket wyes
• 45-degree branch angle — distinguishes the 9875-339 from the 3"x3"x2-1/2" Schedule 40 reducing tee at the same size combination; lower hydraulic minor loss coefficient at the branch junction; smoother flow division geometry; most consequential hydraulic advantage of any reducing wye in the documented Spears 9875 series relative to its tee counterpart — near-equal 2-1/2" branch carries a larger absolute flow fraction from the 3" run, making the 45-degree minor loss reduction most significant at this near-equal branch scale; preferred over the reducing tee in gravity drainage collection, pump suction NPSH-sensitive manifold entries, hydraulically sensitive near-equal-branch lateral supply junctions, and 45-degree routing geometry applications
• 2-1/2" branch socket at ~83% of 3" run diameter — ~69% cross-sectional area ratio; ~1.44x velocity increase at constant full-branch-flow passage; near-equal-branch reducing wye at the 3" run level; highest branch-to-run diameter ratio and lowest velocity increase of any reducing wye documented in this catalog across both the 3" and 4" run service levels; approaches equal-wye flow-division geometry more closely than any other reducing wye in the documented Spears 9875 series
• 2-1/2" IPS as bridge branch size — bridges the commercially predominant 2" and 3" IPS socket PVC pipe sizes; downstream 2-1/2" IPS supply pipe size must be confirmed from downstream assembly manufacturer's connection specification or hydraulic demand analysis before specifying; confirm that downstream demand genuinely requires 2-1/2" IPS supply capacity rather than accommodating either 2" IPS (if within 2" velocity limits) or 3" IPS (if assembly uses 3" socket connections); 2-1/2" IPS pipe and fittings less universally available at local distributors than 2" or 3" IPS — confirm downstream supply chain before finalizing 9875-339 specification
• Near-equal branch velocity verification — at 3" run velocities at or below ~3 ft/s, 2-1/2" downstream velocity at equivalent branch flow ~4.3 ft/s — well within standard 2-1/2" IPS PVC limits; at 3–4 ft/s run velocity, downstream ~4.3–5.8 ft/s — within standard limits, confirm against downstream design velocity requirement; at run velocities approaching 5 ft/s, downstream approaches ~7.2 ft/s — requires explicit confirmation against downstream 2-1/2" assembly design velocity limit
• 3" primary run continues at full diameter through both run sockets — the 9875-339 is a branch junction fitting with two equal 3" run ports; NOT an inline reducer coupling; primary run continues downstream of the 2-1/2" branch at full 3" diameter; distinct from 3"x2-1/2" inline reducer coupling (Spears 829 series) which transitions entire run inline with no continuing 3" run
• Primary comparison — wye versus reducing tee: 9875-339 (45-degree branch, lower minor loss, gravity drainage advantage, near-equal branch flow fraction amplifies hydraulic advantage) where minor loss reduction, drainage lateral contribution geometry, pump suction NPSH, or 45-degree routing governs; 3"x3"x2-1/2" Schedule 40 reducing tee (90-degree branch) where perpendicular routing, space constraints in run-axis direction, or standard specification governs; 45-degree branch departure confirmed from piping layout before purchase — permanently committed at cement application
• Gravity drainage advantage — most pronounced of any reducing wye in documented Spears 9875 series at near-equal 2-1/2" branch scale: lateral contributes a near-equal flow fraction to collection main, amplifying turbulence and flow reversal risk at perpendicular tee entry; 45-degree entry smooths flow contribution most consequentially at near-equal branch scale; preferred specification at 2-1/2" IPS lateral entry points on 3" gravity drainage collection mains in agricultural drainage, site drainage, stormwater collection, and facility drainage applications
• Pump suction manifold advantage — near-equal 2-1/2" branch carrying substantial supply flow fraction from 3" primary suction header produces larger absolute minor loss at branch entry than smaller branch sizes; 45-degree entry reduces this suction-side minor loss most consequentially at near-equal branch scale; most significant pump NPSH preservation advantage of the reducing wye fitting type in the documented Spears 9875 series at the suction-side branch entry function
• Near-equal 2-1/2" branch socket assembly scale — 2-1/2" branch socket is substantially larger relative to run sockets than any other reducing wye branch socket in documented catalog; treat 2-1/2" branch socket cement assembly with same working time management, complete circumferential coverage, and insertion depth discipline applied at the 3" run sockets; do not abbreviate assembly procedure at branch socket despite its slightly smaller size
• Branch socket orientation committed at cement application — two-plane confirmation required before cement: (1) departure plane of 45-degree branch; (2) rotational orientation about run axis; dry-fit against piping layout drawing and reference-mark before cement at any socket; in gravity drainage installations, three-dimensional confirmation including branch invert elevation from grade plan required before cement
• Branch thrust force at buried installations — resultant force: P × A_branch at 2-1/2" IPS cross-sectional area directed at 45 degrees to run axis; moderately larger bearing area than 9875-420's 2" branch at same pressure; bearing surface perpendicular to 45-degree branch axis (at 45 degrees to trench run-axis); bearing area from P × A_branch at 2-1/2" IPS cross-sectional area, full operating pressure including surge transient, and site-specific soil bearing capacity; undisturbed soil in 45-degree bearing direction confirmed; no thrust restraint at either 3" run socket
• Secondary comparison — slip branch socket versus FPT: 9875-339 where downstream 2-1/2" assembly continues in socket PVC pipe construction; FPT wye or tee where first downstream component is 2-1/2" male NPT threaded; at 2-1/2" branch size, socket PVC downstream assemblies predominate over male NPT threaded components in commercial irrigation and distribution markets; confirm from downstream component manufacturer specification
• Three socket connections require planned assembly sequence — upstream 3" run, downstream 3" run, and 2-1/2" branch; all pipe ends positioned and branch orientation dry-fit confirmed before cement at any socket; both 3" run sockets and 2-1/2" branch socket require heavy-body cement; full cure time compliance before pressurization or gravity-flow service
• 2-1/2" branch socket accepts Schedule 40 and Schedule 80 2-1/2" IPS PVC pipe
• 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 3" wye fitting size; predominant correct specification in irrigation lateral supply, gravity drainage, and moderate-pressure process piping applications at the 3"x2-1/2" wye scale
• Manufactured to ASTM D2466 — governing standard for Schedule 40 PVC socket fittings
• NSF 61 certified for potable water contact; NSF 14 listed
• Both run sockets compatible with Schedule 40 and Schedule 80 IPS 3" pipe; branch socket compatible with Schedule 40 and Schedule 80 IPS 2-1/2" pipe
• White color — Schedule 40 material class identification at the branch junction 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 or gravity-flow service
• Pressure rating: verify against manufacturer pressure-temperature table for SKU 9875-339

Specifications:

Industries & Applications:

• Commercial & Agricultural Irrigation — 45-Degree Near-Equal-Branch Supply Connections for Large Zone Supply Sub-Mains, Major Sector Supply Headers, Large-Capacity Filter Station Connections, and Large Chemical Injection Supply Branches on 3" Schedule 40 PVC Primary Laterals and Distribution Mains — The 3" x 2-1/2" Schedule 40 PVC reducing wye is the near-equal-branch lateral supply wye at the 3" run level — specified at 2-1/2" IPS socket PVC branch assembly locations on 3" Schedule 40 PVC irrigation primary laterals and distribution mains where the 45-degree branch angle and near-equal branch scale provide the most commercially significant hydraulic minor loss advantage over the 90-degree reducing tee of any configuration in the Spears 9875 series; large zone supply sub-main branch connections where the 3" IPS primary lateral provides 2-1/2" IPS socket PVC supply to large irrigation zone supply sub-main assemblies — the downstream 2-1/2" IPS sub-main supply assembly carrying a substantial fraction of the 3" lateral's total design flow, making the 9875-339's 45-degree minor loss reduction at the near-equal branch junction most consequential in the lateral's hydraulic head budget relative to the 3"x3"x2-1/2" reducing tee at the same branch location; sector supply header branch connections where the 3" IPS distribution lateral provides 2-1/2" IPS socket PVC supply to major irrigation sector supply header assemblies at distribution main branch locations where the lateral's hydraulic analysis identifies the near-equal branch junction's minor loss as a contributing factor in the available pressure head budget at downstream sector supply points; drip irrigation major sub-main supply branch connections where the 3" IPS primary supply lateral delivers 2-1/2" IPS socket PVC supply to primary drip sub-main distribution assemblies at branch locations along the lateral route, with the 9875-339 specified where the near-equal sub-main supply flow fraction and the lateral's pressure head budget together favor the 45-degree wye's lower minor loss over the reducing tee; large-capacity disc filter station and screen filter station 2-1/2" IPS inlet supply branch connections where the 3" IPS lateral provides 2-1/2" IPS socket PVC supply to large zone-level or sector-level filter station assemblies requiring 2-1/2" IPS supply capacity to accommodate the filter station's design throughput; chemical injection station 2-1/2" IPS supply branch connections where the 3" IPS irrigation main provides 2-1/2" IPS socket PVC supply to high-capacity fertilizer injection assemblies, major pH adjustment chemical supply connections, and high-volume water treatment chemical injection stations requiring 2-1/2" IPS supply capacity; flow meter station and monitoring assembly 2-1/2" IPS supply connections where the 3" IPS primary lateral provides 2-1/2" IPS socket PVC supply to flow metering station assemblies and primary distribution monitoring connections; pump station primary discharge lateral 2-1/2" IPS major branch supply connections where the 3" IPS primary discharge lateral provides 2-1/2" IPS socket PVC supply to major zone sub-main supply assemblies and large sector supply header connections at pump station discharge lateral branch locations; and 3" to 2-1/2" lateral distribution transition branch connections where a 3" IPS primary distribution lateral provides 2-1/2" IPS socket PVC supply to downstream sub-lateral distribution runs serving downstream service sectors, with the near-equal flow fraction of the 2-1/2" branch assembly at the 9875-339 reflecting the downstream 2-1/2" IPS sub-lateral's substantial distribution demand relative to the upstream 3" IPS primary lateral's total throughput; downstream 2-1/2" IPS supply pipe size confirmed from hydraulic demand analysis before specification; 45-degree branch socket departure direction confirmed from piping layout drawing before cement; NSF 61 listing confirms potable water fitness at every irrigation lateral 2-1/2" branch connection
• Gravity Drainage & Stormwater Collection — 45-Degree Near-Equal-Branch 2-1/2" Lateral Connections on 3" Schedule 40 PVC Gravity Drainage Collection Mains and Stormwater Secondary Collection Mains — Specified as the standard near-equal-branch junction fitting in 3" Schedule 40 PVC gravity drainage collection systems at the 2-1/2" lateral scale — the application category where the 9875-339's near-equal branch geometry provides the most pronounced hydraulic advantage of any reducing wye fitting type in the documented Spears 9875 series over its tee counterpart; subsurface agricultural drainage collection main 2-1/2" near-equal lateral branch connections where the 3" IPS collection main receives 2-1/2" IPS lateral drainage contributions from major field drainage laterals or primary drainage collector connections in collecting systems where the 2-1/2" lateral's drainage flow contribution represents a near-equal fraction of the collection main's total flow — the 9875-339's 45-degree entry reducing turbulence, flow reversal, and hydraulic jump potential at the lateral entry junction most consequentially at this near-equal contribution scale, where the perpendicular tee entry would produce the most severe flow reversal and turbulence of any documented reducing wye branch size scenario; site drainage secondary collection main 2-1/2" major lateral connections where the 3" IPS collection main receives 2-1/2" IPS contributions from large area drainage outlet connections and major site drainage assemblies whose flow contribution approaches the near-equal fraction that the 9875-339's branch geometry represents; landscape and turf drainage collection trunk 2-1/2" lateral connections where the 3" IPS drainage collection trunk serves as the primary collection line for large 2-1/2" IPS drainage lateral connections in major golf course drainage collection networks, large sports field primary drainage systems, and large landscape drainage networks — the 9875-339 providing smooth near-equal lateral entry geometry at each 2-1/2" IPS connection point along the 3" collection trunk; stormwater secondary collection main 2-1/2" major lateral connections where the 3" IPS stormwater collection main receives 2-1/2" IPS lateral contributions from large catch basin outlet connections, major area drain assemblies, and large stormwater inlet assemblies whose storm flow contributions approach near-equal fractions of the collection main's peak design flow; commercial site primary drainage collection main 2-1/2" major lateral connections where the 3" IPS collection main receives 2-1/2" IPS lateral contributions from large parking area drainage outlets, major building perimeter drainage assemblies, and large paved surface drainage collection connections; facility drainage primary collection main 2-1/2" lateral connections where the 3" IPS collection trunk receives 2-1/2" IPS lateral contributions from major equipment drainage connections, large floor drain collection assemblies, and major process area drainage outlets; branch socket orientation in gravity drainage installations confirmed in three dimensions — departure plane, rotational orientation about run axis, and confirmed invert elevation of 2-1/2" lateral branch socket above collection main flow line — from drainage grade plan, invert elevation calculations, and collection main alignment drawings before cement at any socket; NSF 61 listing confirms potable water fitness at drainage installations where NSF-listed materials are required
• Pump Station & Pump System Manifolds — 45-Degree Near-Equal-Branch 2-1/2" IPS Supply Connections at Pump Suction Manifolds, Pump Discharge Headers, and Manifold Supply Assemblies on 3" Schedule 40 PVC Pump Assembly Headers — Used at 2-1/2" IPS socket PVC branch supply entry locations on 3" Schedule 40 PVC pump suction and discharge manifold assemblies where the near-equal 45-degree branch entry provides the most operationally significant pump suction NPSH preservation advantage of any reducing wye fitting in the documented Spears 9875 series at the suction-side branch supply function; irrigation pump station 3" IPS primary suction manifold 2-1/2" IPS near-equal branch supply entries where the 9875-339 is installed at pump suction supply branch entry points whose 2-1/2" IPS supply connections draw near-equal supply flow fractions from the 3" primary suction header — the near-equal flow fraction and the 45-degree entry geometry combining to produce the maximum suction-side minor loss reduction available at the 3"x2-1/2" branch junction, contributing most significantly to preserving available NPSH at the pump impeller inlet at pump stations where the NPSH analysis identifies suction-side minor loss reduction at near-equal branch supply entries as required to maintain NPSH above the pump's NPSH_required at design flow; pump station primary suction manifold 2-1/2" IPS branch entries where the pump's connection specification requires a 2-1/2" IPS inlet connection drawing supply from the 3" primary suction header — the 9875-339 providing the 45-degree entry geometry that minimizes the suction-side pressure drop at the pump suction supply connection relative to a perpendicular tee entry at the same branch size; pump station 3" IPS primary discharge header 2-1/2" IPS major zone supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC branch supply to large zone supply assemblies and major distribution connections at pump station discharge header branch locations; pump station 3" IPS primary header 2-1/2" IPS drain and blowoff branch connections at major drain and blowoff locations; booster pump station 3" IPS primary manifold 2-1/2" IPS branch connections at discharge supply assemblies and secondary pump suction supply entries requiring 2-1/2" IPS supply capacity; process pump suction manifold 3" IPS header 2-1/2" IPS supply branch entries where the 9875-339 provides smooth near-equal 45-degree branch supply entries at process pump suction manifold supply connections; the pump station operating pressure including shut-off head and surge transient must be confirmed within the Schedule 40 pressure ceiling at the 3" wye fitting before Schedule 40 material class is finalized at pump station piping locations
• Water Treatment Plant — 45-Degree Near-Equal-Branch 2-1/2" IPS Branch Connections at Primary Distribution Header Major Zone Supply Branches, Large Chemical Dosing Supply Connections, and Large Instrument Supply Branches on 3" Schedule 40 PVC Distribution Headers — Installed at 2-1/2" IPS socket PVC branch connection locations on 3" Schedule 40 PVC primary distribution headers in municipal and industrial water treatment plants where the near-equal 45-degree wye branch provides the most hydraulically significant minor loss reduction at the branch junction — filter gallery 3" IPS distribution header 2-1/2" IPS major zone supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to major filter gallery zone supply assemblies and large parallel process unit supply headers requiring 2-1/2" IPS supply capacity, with the near-equal 45-degree branch entry preserving distribution header pressure at downstream zone supply branches through maximum minor loss reduction at the near-equal branch junction; plant service water distribution header 2-1/2" IPS major branch supply connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large plant service water zone assemblies; primary distribution header 2-1/2" IPS major chemical dosing supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large chemical dosing station assemblies requiring 2-1/2" IPS supply capacity; clearwell supply header 2-1/2" IPS branch connections at major supply zone entries; and primary distribution header 2-1/2" IPS major drain and blowoff branch connections; NSF 61 listing confirms potable water fitness at every water treatment plant distribution header branch connection
• Municipal Water Distribution — 45-Degree Near-Equal-Branch 2-1/2" IPS Branch Connections at Secondary Distribution Header Major Zone Supply Branches and Large Service Connection Branches on 3" Schedule 40 PVC Secondary Distribution Mains — Specified at 2-1/2" IPS socket PVC near-equal branch connection locations on 3" Schedule 40 PVC secondary distribution mains in municipal water distribution systems where the 45-degree wye branch angle is preferred at near-equal supply branch locations — secondary distribution main 2-1/2" IPS major zone supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large commercial service zone supply assemblies and major service line supply connections whose demand approaches the near-equal flow fraction of the 3" secondary distribution main's total flow, making the near-equal 45-degree wye entry most hydraulically advantageous at these high-demand branch locations; secondary distribution main 2-1/2" IPS drain valve branch connections at major low-point drain locations; secondary distribution main 2-1/2" IPS air release valve supply branch connections at high-point locations requiring 2-1/2" IPS supply capacity; and secondary distribution main 2-1/2" IPS sub-lateral supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to downstream sub-lateral distribution headers; NSF 61 listing confirms potable water fitness at every municipal distribution secondary main near-equal branch connection
• Industrial Process Piping — 45-Degree Near-Equal-Branch 2-1/2" IPS Branch Connections at Primary Process Header Major Zone Supply Branches, Large Equipment Supply Connections, and High-Flow Branch Supply Assemblies on 3" Schedule 40 PVC Process Headers — Used at 2-1/2" IPS socket PVC near-equal branch connection locations on 3" Schedule 40 PVC primary process headers in manufacturing plants, chemical processing facilities, and industrial environments where the near-equal 45-degree branch provides the most consequential hydraulic minor loss reduction — process water supply header 2-1/2" IPS major zone supply and large equipment supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large process equipment supply connections and major zone supply valve assemblies requiring 2-1/2" IPS supply capacity; cooling water distribution header 2-1/2" IPS major equipment supply branches where the 9875-339 provides 2-1/2" IPS socket PVC supply to large cooling equipment supply connections and major cooling circuit zone supply assemblies; plant utility water primary main 2-1/2" IPS major drain and blowoff branch connections and large service supply branches; process supply header 2-1/2" IPS major chemical injection and treatment chemical supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large chemical injection assemblies; and process pump suction manifold 3" IPS header 2-1/2" IPS near-equal branch supply entries where the near-equal supply flow fraction and 45-degree entry geometry together provide the maximum suction-side NPSH preservation in the 3" IPS suction manifold assembly; Schedule 40 white PVC satisfies material specification where Schedule 40 is the system standard
• Municipal Well Field & Water Supply Infrastructure — 45-Degree Near-Equal-Branch 2-1/2" IPS Branch Connections at Primary Distribution Header Major Zone Supply Branches and Large Chemical Injection Supply Connections on 3" Schedule 40 PVC Distribution Headers — Installed at 2-1/2" IPS socket PVC near-equal branch connection locations on 3" Schedule 40 PVC distribution headers in municipal well field and water supply infrastructure — primary distribution header 2-1/2" IPS major zone supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large service zone supply assemblies and major distribution connections; distribution header 2-1/2" IPS large chemical injection supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large chlorination supply assemblies, major fluoridation supply connections, and large water treatment chemical injection station connections requiring 2-1/2" IPS supply capacity; distribution header 2-1/2" IPS major drain and blowoff branch connections at header drain locations requiring 2-1/2" IPS capacity; and pump station primary header 2-1/2" IPS major suction supply and discharge branch connections; NSF 61 listing confirms potable water fitness throughout
• HVAC & Large Commercial Mechanical Systems — 45-Degree Near-Equal-Branch 2-1/2" IPS Branch Connections at Primary Distribution Main Major Zone Supply Branches, Large Condenser Water Supply Connections, and High-Demand Branch Supply Assemblies on 3" Schedule 40 PVC Distribution Headers — Used at 2-1/2" IPS socket PVC near-equal branch connection locations on 3" Schedule 40 PVC primary chilled water distribution headers, condenser water distribution headers, and large-capacity hydronic distribution headers in commercial campus and institutional mechanical systems — campus chilled water distribution header 2-1/2" IPS major zone supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large building unit supply connections and major campus sector supply assemblies requiring 2-1/2" IPS supply capacity; condenser water distribution header 2-1/2" IPS major equipment supply branches where the 9875-339 provides 2-1/2" IPS socket PVC supply to large cooling tower circuit assemblies and major condenser water equipment supply connections; primary distribution header 2-1/2" IPS major chemical treatment supply branches where the 9875-339 provides 2-1/2" IPS socket PVC supply to large cooling water treatment chemical injection assemblies; and campus primary distribution main 2-1/2" IPS major zone supply branches at high-demand campus building connections; Schedule 40 white PVC satisfies material specification where Schedule 40 is the system standard
• Aquaculture & Large-Scale Water Management Infrastructure — Installed at 2-1/2" IPS socket PVC near-equal branch connection locations on 3" Schedule 40 PVC primary supply, recirculation, and distribution mains in commercial aquaculture facilities, hatchery systems, and recirculating aquaculture systems (RAS) where the near-equal 45-degree branch geometry provides the most hydraulically significant branch junction advantages — primary recirculation main 2-1/2" IPS major zone supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large recirculation zone supply assemblies and major production area recirculation distribution connections requiring 2-1/2" IPS supply capacity; primary supply main 2-1/2" IPS major lateral supply branches where the 9875-339 provides 2-1/2" IPS socket PVC supply to large hatchery production section supply assemblies and major rearing hall zone supply headers; primary supply main 2-1/2" IPS large chemical treatment supply branch connections where the 9875-339 provides 2-1/2" IPS socket PVC supply to large water quality treatment chemical injection assemblies requiring 2-1/2" IPS supply capacity; recirculation pump suction manifold 3" IPS header 2-1/2" IPS near-equal branch supply entries where the 9875-339 provides smooth near-equal 45-degree branch supply entries at major recirculation pump suction supply connection points, providing the maximum suction-side NPSH preservation available at the 3"x2-1/2" branch junction scale in the recirculation pump station; facility gravity drainage collection main 2-1/2" IPS near-equal lateral connections where the 9875-339 provides smooth 45-degree near-equal gravity drainage lateral branch connections at major production area drainage outlet connections — the near-equal 2-1/2" lateral's drainage flow contribution amplifying the hydraulic case for the 45-degree wye over the perpendicular tee at these high-contribution drainage entry points; NSF 61 listing confirms fitness for every branch connection in the primary aquaculture supply and recirculation distribution system