Tee, Slip x Slip x FPT PVC Schedule 40 8" x 8" x 2 1/2" (402-579)

The 8" x 8" x 2-1/2" PVC Schedule 40 Tee (402-579) joins solvent-weld slip connections on the 8" run ports with a 2-1/2" female pipe thread (FPT) branch outlet — delivering a mid-bore threaded branch takeoff directly off a large-diameter cemented main line without requiring a separate threaded adapter fitting at the junction. The slip x slip x FPT configuration consolidates the branch connection into a single fitting, reducing installed component count, minimizing potential leak points, and providing a serviceable, removable branch interface at a size that bridges the gap between the small tap applications of a 2" FPT branch and the primary sub-distribution role of a 4" FPT branch.

The 2-1/2" FPT branch occupies a functionally distinct position in the 402 series — larger than a typical instrumentation or monitoring tap, yet smaller than a primary zone feed or sub-main header connection. This mid-bore sizing makes the 402-579 particularly well suited for applications requiring meaningful secondary flow capacity at the branch — bypass loops, secondary filtration feeds, fire department connections, pump suction taps, and mid-capacity valve stations — where a 2" branch would be hydraulically undersized but a 4" branch would represent unnecessary oversizing for the secondary flow demand.

The 2-1/2" FPT branch accepts any standard NPT-threaded male fitting — valves, nipples, reducers, or caps — and can be isolated, serviced, or reconfigured independently of the permanently cemented 8" main line. This serviceability advantage is the defining reason this connection configuration is specified over an all-slip equivalent at the branch port, and it makes the 402-579 a practical long-term asset in systems where branch access, flow measurement, or periodic equipment replacement is anticipated over the life of the installation.

Manufactured from white PVC compound meeting ASTM D2466 dimensional standards, the 402-579 delivers the corrosion resistance, chemical inertness, and long-term durability that make Schedule 40 PVC the preferred material for large-bore water distribution, irrigation infrastructure, and industrial process piping at this diameter and pressure range.

Specifications:

Apply PTFE tape or pipe thread sealant to male NPT threads before assembly on the 2-1/2" FPT branch. Do not overtighten threaded connections — hand-tight plus one to two turns is the standard assembly practice for PVC NPT joints. Heavy-bodied solvent cement is recommended for 8" slip socket joints. Allow full cure time before pressurizing. Pressure-temperature derating applies at elevated service temperatures per ASTM standards.

Industries & Applications:

• Municipal Water Distribution — 8" transmission and primary distribution mains requiring a 2-1/2" threaded branch for fire department connections, blow-off assemblies, pressure zone control valves, or mid-capacity service lateral feeds where a removable threaded interface is preferred over a permanently cemented branch joint
• Agricultural & Large-Scale Irrigation — 8" mainline trunk systems with a 2-1/2" threaded branch outlet for mid-capacity zone valve stations, pump bypass connections, filter station inlets, or fertigation system feeds on large farms, golf courses, and managed landscape installations where 2" is undersized but 4" exceeds the secondary flow requirement
• Industrial Process Piping — High-volume fluid transfer headers requiring a 2-1/2" threaded branch for bypass loop connections, secondary process feeds, mid-capacity chemical dosing inlets, or flow meter installations where the threaded interface supports future instrument replacement or process reconfiguration without main line disruption
• Fire Protection & Suppression Systems — 8" underground or above-grade supply mains with a 2-1/2" FPT branch for fire department connections (FDC), hose valve outlets, or dedicated suppression riser feeds where 2-1/2" is the standardized fire service connection diameter
• Water & Wastewater Treatment — Plant distribution headers with 2-1/2" threaded branch connections for secondary process feeds, backwash supply inlets, chemical dosing headers, or mid-capacity flow control valve stations in treatment plant process piping
• Industrial Cooling & HVAC Systems — 8" chilled water or condenser water distribution mains requiring a 2-1/2" threaded branch for bypass circuit connections, secondary cooling loop feeds, chemical treatment injection headers, or mid-capacity equipment supply connections
• Pump Systems & Booster Stations — 8" suction or discharge mains with a 2-1/2" threaded branch for pump bypass valves, pressure relief connections, recirculation loop inlets, or jockey pump supply taps in booster station piping configurations
• Aquaculture & Water Management — High-flow recirculation or intake headers requiring a 2-1/2" threaded branch for mid-capacity flow control valves, aeration system feeds, treatment bypass connections, or secondary distribution to parallel raceway or pond inlet manifolds