Reducing Tee, Slip x Slip x Slip PVC Schedule 80 10" x 10" x 4" (801-624)

The 10" x 10" x 4" Schedule 80 Gray PVC Reducing Tee (801-624, Slip x Slip x Slip) is a large-diameter, heavy-wall specialty tee fitting manufactured to ASTM D2467 in Schedule 80 gray PVC — a reducing tee configuration in which the run connections are 10" and the branch connection is 4", providing a single-body Schedule 80 PVC solution for taking a 4" lateral branch connection off a 10" primary transmission or distribution main without reducing the primary flow path diameter, without field-fabricated saddle taps or custom manifold assemblies, and without transitioning out of Schedule 80 gray PVC construction at the branch takeoff point. The 801-624 is the correct fitting where a 10" Schedule 80 PVC primary main must supply a 4" branch connection — where the downstream zone, sector, equipment, or service connection has been established at 4" by the hydraulic design, where the primary 10" run must continue at full diameter with zero restriction through the straight-run ports, and where the branch connection must be a manufactured, rated, NSF-listed, ASTM D2467-compliant Schedule 80 gray PVC fitting at every lateral branch takeoff point in the 10" primary main system.

The 10" x 10" x 4" configuration occupies a fundamentally different position in the large-diameter Schedule 80 PVC reducing tee series than the near-equal configurations at the same run size. The 4" branch at 40% of the 10" run diameter is a true lateral branch takeoff — a hydraulic relationship where the branch carries a small fraction of the primary run flow, the primary main's straight-run flow path is essentially unaffected by the branch connection in terms of velocity and pressure loss, and the fitting functions as a single-point service connection between a large primary transmission or distribution main and a mid-commercial 4" zone supply, service lateral, equipment feed, or process branch line. This is the most operationally common branch connection geometry in large-diameter primary PVC system design — the configuration that appears repeatedly along the length of a primary main wherever a 4" zone supply lateral, equipment connection, hydrant branch, or service connection must be taken off the primary trunk without interrupting or restricting the primary flow. Where the near-equal 801-628 (10" x 10" x 8") reflects a hydraulic design where the branch carries the large majority of the primary flow and the fitting operates under near-equal three-way junction conditions, the 801-624 reflects a hydraulic design where the 4" branch draws a modest fraction of the primary main flow and the primary trunk continues at essentially full capacity through the straight run — a hydraulically and structurally different condition that is also the most frequently occurring branch takeoff scenario in large-diameter primary system layouts across the municipal, industrial, and commercial irrigation markets.

The 4" branch size connects the 10" primary main to the most commercially active mid-scale pipe size in the commercial PVC fitting line. At 4", the downstream branch system enters the pipe size range that serves the widest range of commercial and industrial applications — the most common commercial irrigation main and zone header size, the most common commercial pool and spa primary recirculation main size, the primary service lateral size for mid-scale commercial buildings, the primary equipment supply connection size for mid-scale process equipment, and the primary zone supply pipe size in municipal water distribution systems serving residential and small commercial service areas. The 801-624 is therefore not only a large-diameter primary main fitting — it is simultaneously a connection point between the 10" primary infrastructure system and the entire mid-commercial 4" distribution and service system, and its specification must account for both the large-diameter structural and pressure performance requirements of the 10" run connections and the 4" branch connection requirements of the downstream commercial distribution or service system it feeds.

Schedule 80 gray PVC construction is the correct and only material specification for this fitting across every application where the 10" x 10" x 4" reducing tee configuration is required in a Schedule 80 piping system. The Schedule 80 wall thickness at both the 10" run connections and the 4" branch port provides the structural integrity and pressure performance appropriate for a large-diameter primary main fitting where the run connections experience the full internal pressure and flow conditions of the 10" primary main and the branch port must transition cleanly from the large-diameter primary to the 4" lateral branch without stress concentration at the branch entry geometry that Schedule 40 wall thickness at the 4" branch port would introduce under sustained 10" primary main service conditions. The Schedule 80 body throughout — not just at the 10" run connections but uniformly through the full tee geometry including the 4" branch port and the transition zone between the 10" run body and the 4" branch — provides the structural continuity and material class consistency that Schedule 80 system specifications require at every primary main branch fitting regardless of the branch size. The gray color provides the permanent, inspectable Schedule 80 material class identification at the primary main branch connection — confirming the installed material class for inspectors, maintenance engineers, and facility managers at the most frequently occurring branch connection fitting in the 10" primary main system. PVC Type 1 Grade 1 construction with cell classification 12454 per ASTM D1784 provides 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 80 PVC primary main service. The 10" run socket connections and the 4" branch socket connection all solvent cement directly onto standard IPS Schedule 40 or Schedule 80 PVC pipe of the corresponding nominal sizes — 10" IPS schedule pipe on both run ports and 4" IPS schedule pipe on the branch port. At the 10" socket connections, heavy-body solvent cement is mandatory, pre-planned assembly with both 10" pipe ends accessible and positioned before cement application begins is essential, and full cure time compliance before any system pressurization is non-negotiable. The 4" branch socket connection requires the same heavy-body cement and full cure compliance as the 10" run sockets — the branch socket on a large-diameter primary main fitting carries the full operating pressure of the primary system at the branch port regardless of the branch pipe size, and joint integrity at the 4" branch connection is as critical as at the 10" run connections from a primary system pressure standpoint.

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 primary main branch fitting for municipal water treatment and distribution systems, large potable water pump station distribution headers, and large commercial and institutional water supply primary mains where NSF-listed materials are required at every fitting in the primary distribution system regardless of the branch size at the lateral takeoff point. ASTM D2467 governs Schedule 80 PVC socket fittings and defines the manufacturing, dimensional, and pressure performance requirements the 801-624 is produced to. Verify manufacturer pressure rating documentation for the specific fitting configuration before final system specification — at the 10" x 10" x 4" reducing tee configuration, the governing pressure rating is determined by the largest port size (10") and the fitting's tested performance at this large-diameter lateral branch geometry, and must be confirmed against the manufacturer's published pressure-temperature rating table for SKU 801-624 before installation in systems at or near the fitting's rated pressure ceiling.

Key Features:

• Schedule 80 gray PVC reducing tee — 10" x 10" run x 4" branch, all socket (slip) ends
• Lateral branch configuration — 4" branch at 40% of 10" run diameter; true lateral branch takeoff off large-diameter primary main
• Primary 10" straight-run flow path maintained at full diameter with zero branch-induced restriction
• Most operationally common branch takeoff geometry in 10" primary main system design — repeated at every 4" service lateral, zone supply, hydrant branch, and equipment connection point along the primary main route
• Connects the 10" primary infrastructure system to the most commercially active mid-scale pipe size in the commercial PVC distribution line
• Manufactured to ASTM D2467 — the governing standard for Schedule 80 PVC socket fittings
• NSF 61 certified for potable water contact; NSF 14 listed
• Solvent cement socket connections compatible with Schedule 40 and Schedule 80 IPS pipe at both run and branch sizes
• Gray color — universal Schedule 80 material class identification at the primary main branch connection
• Schedule 80 wall thickness throughout the full tee body including the 4" branch port — maintains material class continuity at every primary main branch connection regardless of branch size
• Cell classification PVC 12454 per ASTM D1784
• Heavy-body solvent cement required at all three socket connections including the 4" branch; full cure time compliance mandatory before pressurization
• Pressure rating: verify against manufacturer pressure-temperature table for SKU 801-624

Specifications:

Industries & Applications:

• Municipal Water Distribution — Primary Transmission Main Zone Supply and Service Lateral Connections — The 10" x 10" x 4" Schedule 80 reducing tee is the fitting specified repeatedly along the length of 10" municipal water transmission and primary distribution mains wherever a 4" zone supply lateral, service lateral, or distribution branch must be taken off the 10" primary trunk — connections supplying 4" zone distribution headers serving residential and small commercial service areas, 4" fire hydrant branch supply connections, 4" service lateral connections to mid-scale commercial buildings, and 4" pressure zone supply branches feeding smaller sub-zone distribution systems; at municipal scale, every branch connection fitting on a 10" primary transmission main is a formally specified, permitted, and inspected infrastructure component regardless of branch size, and the 801-624 provides the manufactured, rated, NSF-listed, ASTM D2467-compliant single-body Schedule 80 PVC solution for 4" lateral branch takeoffs at primary transmission main junction points in large municipal PVC water distribution system construction; the 4" branch size makes the 801-624 the most frequently installed reducing tee configuration along the length of 10" primary distribution mains in municipal systems where 4" is the standard zone supply and service lateral size
• Water Treatment Plant — Primary Header Zone Supply and Equipment Branch Connections — Installed at 4" branch connection points on 10" primary distribution headers in municipal and industrial water treatment plants — clearwell supply and distribution primary trunks supplying 4" zone distribution connections to treatment equipment, sampling stations, and instrument supply headers; filter influent and effluent primary headers branching to 4" individual filter cell supply and return connections; backwash primary supply mains connecting to 4" individual filter backwash connections; and plant service water primary headers supplying 4" equipment supply branches throughout the treatment facility; the 4" branch at water treatment plant primary header level is the standard branch size for individual equipment connections, instrument supply headers, chemical dilution water supply connections, and small process equipment supply branches taken off the 10" primary service water header; NSF 61 listing makes this fitting appropriate for every potable water treatment primary distribution branch connection, and Schedule 80 gray PVC construction satisfies the material class requirements at primary header branch connections throughout the water treatment plant
• Pump Station — Primary Header to Branch Supply and Instrument Connections — Used at 4" branch supply connections off 10" primary pump station headers where the 10" primary pump discharge or suction header must supply 4" branches to individual pump unit bypass connections, pump suction or discharge instrument connections, pressure relief valve supply branches, check valve bypass lines, system drain connections, and secondary supply connections to auxiliary pump station equipment; the 4" branch at pump station primary header level is the standard branch size for auxiliary connections, instrument and gauge supply branches, pressure relief and bypass connections, and secondary equipment supply lines that must be taken directly off the 10" primary header while the primary straight-run flow path continues uninterrupted through both 10" run ports; Schedule 80 construction satisfies the material specification requirements at all primary header branch connections regardless of branch size in pump station piping systems where Schedule 80 is the system-wide material standard
• Industrial Process Piping — Primary Header Equipment Branch Connections — Used at 4" lateral branch takeoff points on 10" process water primary headers, cooling water primary distribution trunks, plant utility water primary mains, and large-volume industrial process fluid primary distribution headers in manufacturing plants, chemical processing facilities, petrochemical support facilities, and heavy industrial environments where the 10" primary process header must supply 4" branches to individual process equipment cooling connections, heat exchanger supply and return branches, process unit isolation and drain connections, secondary distribution branches to localized process equipment clusters, and lateral supply connections to mid-scale process equipment sections; the 4" branch is the most common lateral branch size taken off large-diameter primary process headers in industrial facilities, appearing at multiple points along the 10" primary header route wherever mid-scale process equipment requires a dedicated 4" supply connection from the primary distribution system; Schedule 80 gray PVC construction provides the chemical resistance, structural wall thickness, and material class documentation required at large-diameter primary header lateral branch connections throughout the industrial process piping system
• Large Commercial & Agricultural Irrigation — Primary Trunk Zone Supply Connections — Specified at 4" lateral branch takeoff points on 10" primary irrigation transmission mains at large commercial irrigation systems — major golf course and resort irrigation systems, large-acreage agricultural operations, and regional landscape irrigation projects where the 10" primary transmission main must supply 4" zone supply headers, sector isolation valve inlet connections, and lateral distribution branch headers feeding individual irrigation zones along the primary main route; the 4" branch is the standard zone supply lateral size in large commercial irrigation systems served by 10" primary transmission mains — the pipe size that carries the flow from the primary main to the zone valve manifold or sector isolation valve assembly where the irrigation system's zone-level distribution begins; the 801-624 is the fitting repeated at every zone takeoff point along the 10" primary main route in commercial irrigation systems where Schedule 80 PVC is the specified system material
• Municipal Well Field — Primary Collection Header Service Connections — Used at 4" branch connections on 10" primary well field collection or distribution headers in municipal and commercial well field installations — individual well pump bypass connections, sample tap supply branches, chemical injection point supply connections, pressure gauge and instrument supply branches, and secondary service connections taken off the 10" primary collection or distribution header; the 4" branch at well field primary header level is the standard size for auxiliary service, instrumentation, and bypass connections that must be taken directly off the primary header without reducing or interrupting the primary flow path; Schedule 80 construction satisfies the material specification and pressure performance requirements at all branch connections on 10" well field primary headers where Schedule 80 PVC is the system material standard
• Industrial Water & Wastewater Treatment — Primary Process Header Branch Connections — Installed at 4" lateral branch connection points on 10" primary process distribution headers in industrial wastewater treatment, water reclamation, and large-scale industrial water management facilities — clarifier influent headers supplying 4" individual clarifier feed connections, primary effluent distribution mains supplying 4" individual disposal connection branches, aeration system primary supply headers connecting to 4" individual aeration zone supply branches, and primary chemical feed distribution headers supplying 4" chemical injection point connections along the primary header route; the 4" branch is the most commonly recurring lateral branch size along 10" primary process distribution headers in treatment facilities, appearing at every point where an individual process unit, treatment zone, or equipment connection must be supplied from the primary header; Schedule 80 gray PVC construction handles the chemical service, process fluid contact, and structural loading conditions at primary process header lateral branch connections throughout industrial treatment environments
• HVAC & Large Commercial Mechanical Systems — Primary Main Zone and Equipment Supply Branches — Specified at 4" lateral branch supply connections on 10" primary chilled water distribution mains, condenser water primary trunks, and large-capacity hydronic heating and cooling primary distribution headers in large commercial campus, institutional, and industrial mechanical systems where the 10" primary distribution main must supply 4" branches to individual building loop supply connections, terminal air handling unit supply branches, medium-scale fan coil unit group supply headers, and equipment room supply connections serving clusters of terminal mechanical equipment; the 4" branch is the standard lateral branch size for individual building or zone connections taken off 10" primary HVAC distribution mains in large campus and institutional mechanical systems where the primary main routes between buildings or mechanical rooms and supplies 4" lateral connections at each building or zone supply point along the primary main route; Schedule 80 PVC construction satisfies the material specification requirements at 10" primary distribution lateral branch connections in large commercial mechanical systems where Schedule 80 is the system material standard