Reducing Tee, Slip x Slip x FPT PVC Schedule 40 3" x 3" x 1-1/4" (402-336)

The 402-336 is a 3-inch Schedule 40 PVC reducing tee with slip (socket) connections on both run ends and a 1-1/4-inch female pipe thread (FPT) connection on the branch outlet. Within the 402-series family of 3-inch reducing tees, the 1-1/4-inch FPT branch serves a specific and well-defined role: a medium-capacity threaded branch port sized to match equipment connections, valve bodies, and legacy piping assemblies where 1-1/4-inch NPT is the specified or installed thread size. Unlike 1-inch or 1-1/2-inch NPT — both near-universal sizes found across nearly every equipment category — 1-1/4-inch NPT appears in targeted contexts: specific centrifugal pump body connections, filter vessel inlet and outlet nozzles, certain manifold valve bodies, and existing piping systems originally built to 1-1/4-inch dimensional standards.

Buyers specifying the 402-336 are most often matching to one of these equipment-driven requirements rather than selecting a branch size from scratch. The 1-1/4-inch FPT branch provides a direct, adapter-free threaded connection to those equipment nozzles and valve ports, eliminating the reducing bushing or threaded adapter that would otherwise be required between a smaller branch port and the equipment connection. The branch carries genuine medium-flow capacity — meaningfully more than a 1-inch branch and appropriate for bypass lines, secondary distribution feeds, and equipment supply connections where actual throughput matters alongside the threaded connection requirement.

The 3-inch run passes full mainline flow through the fitting body without restriction while the 1-1/4-inch threaded branch handles its side connection independently. The mixed connection architecture — permanent solvent weld on the 3-inch run ends, serviceable threaded on the 1-1/4-inch branch — keeps the mainline as a fixed, permanent installation while allowing the branch connection to be broken and remade for equipment service, replacement, or reconfiguration without disturbing the solvent welded run.

Both 3-inch run ends require heavy-bodied PVC solvent cement applied thoroughly and quickly to both the pipe end and socket bore. Pipe should be seated immediately with a quarter-turn rotation to distribute cement evenly, then held firmly for 30 seconds. Allow a full 24-hour cure before pressurizing the system. The 1-1/4-inch FPT branch accepts male NPT fittings assembled with PTFE thread tape or appropriate thread sealant — do not overtighten threaded connections into PVC female threads.

This fitting is manufactured from virgin PVC compound conforming to ASTM D1784 Cell Classification 12454 and dimensioned to ASTM D2466 standards for Schedule 40 PVC socket fittings.

Specifications:

Pressure rating is for water service at 73°F. Derate for elevated temperatures per manufacturer guidelines. Use heavy-bodied PVC solvent cement for 3-inch socket joints. Use PTFE thread tape or appropriate thread sealant on the 1-1/4" FPT branch — do not overtighten threaded connections into PVC female threads.

Industries & Applications:

The 402-336 reducing tee is specified wherever a 3-inch Schedule 40 PVC mainline requires a 1-1/4-inch threaded branch for equipment-matched connections, medium-flow service takeoffs, or legacy system tie-ins:

• Pump & Equipment Connections — Direct branch connections from 3-inch mainlines to pump body inlets, outlets, and priming ports where 1-1/4-inch NPT is the specified equipment connection size, eliminating the reducing bushing otherwise required between a smaller branch port and the pump nozzle
• Filter Vessel Nozzles & Manifold Connections — Branch takeoffs on 3-inch supply and return headers connecting to filter housings, strainer bodies, and manifold valve ports where 1-1/4-inch NPT nozzle connections are specified by the equipment manufacturer
• Irrigation & Agricultural Distribution — Medium-flow zone supply connections and bypass lines on 3-inch irrigation headers where a 1-1/4-inch FPT branch feeds zone valve assemblies, filter stations, and distribution sub-headers requiring more flow capacity than a 1-inch branch delivers
• Chemical Processing & Water Treatment — Medium-volume chemical treatment branch feeds on 3-inch process headers where a 1-1/4-inch threaded takeoff supplies treatment skids, bypass loops, and secondary process equipment with flow volumes that exceed 1-inch branch capacity
• Legacy System Tie-Ins & Retrofits — Branch connections from new 3-inch PVC mainlines into existing 1-1/4-inch threaded piping systems, avoiding the need for a separate tee and reducing adapter when integrating new Schedule 40 runs into legacy infrastructure originally built to 1-1/4-inch dimensional standards
• Municipal & Commercial Plumbing — Service connections, secondary supply branches, and equipment taps on 3-inch utility water mains where 1-1/4-inch threaded ports serve specific fixture connections, zone supply branches, and equipment nozzles that require this nominal size
• Industrial Process Piping — Secondary process feed takeoffs and service branch connections on 3-inch reagent distribution and utility water headers where 1-1/4-inch NPT branch connections match downstream equipment, control valve bodies, or inline instrument housings at their specified connection size
• HVAC & Cooling Systems — Medium-flow bypass and side-stream treatment connections on 3-inch condenser water and cooling tower supply headers where 1-1/4-inch threaded branch ports serve chemical treatment equipment, bypass flow control valves, and secondary loop feeds sized to this connection standard