Reducing Tee, Slip x Slip x FPT PVC Schedule 40 1" x 1" x 3/4" (402-131)

This 1" × 3/4" Schedule 40 PVC Slip × Slip × FPT Reducing Tee provides a reducing female-threaded branch outlet off a 1" solvent-cemented PVC run, combining permanent 1" slip socket run ports with a reducing 3/4" female NPT threaded branch connection in a single fitting. The two 1" slip socket run ports accept standard 1" PVC pipe for solvent cement joining along the through-run, while the 3/4" FPT branch outlet receives any compatible 3/4" male-threaded fitting, valve, nipple, or equipment connection at the branch position without additional adapters or reducing components at the branch face.

The mixed Slip × Slip × FPT construction is the defining characteristic that places the 402-131 precisely between two closely related fittings at the same 1" run size. The 401-126 (1" × 1" × 3/4" Slip × Slip × Slip, previously written) is the all-socket counterpart — it serves the same 1" run with a reducing 3/4" branch, but the branch presents a slip socket for a cemented 3/4" PVC pipe continuation rather than a female-threaded outlet. The 402-131 is the correct selection when the downstream connection at the 3/4" branch is a male-threaded component — a 3/4" NPT ball valve, gate valve, solenoid valve, strainer body, flow meter, or equipment nozzle — rather than a cemented 3/4" pipe run. If the branch continues as a solvent-welded pipe run downstream, the 401-126 applies; if the branch must connect to a threaded component, the 402-131 is the correct fitting.

The combined function of the 402-131 — directing the 1" run while simultaneously reducing the branch to a 3/4" FPT threaded outlet — eliminates a separate fitting that would otherwise be required. A 1" × 1" × 3/4" all-socket tee (401-126) plus a 3/4" female adapter at the branch outlet achieves the same directional branch and socket-to-thread transition, but requires two fittings and three joints rather than the single fitting and two run joints of the 402-131. The mixed-connection tee accomplishes the branch direction, the branch size reduction, and the socket-to-thread transition in a single body — reducing joint count and assembly footprint at every position in a 1" Schedule 40 system where a 90° branch must connect to a 3/4"-ported threaded component.

At the 1" × 3/4" mixed-connection combination, this is a high-frequency configuration in residential and commercial Schedule 40 systems. The 1" pipe size serves primary headers, lateral mains, equipment supply runs, and distribution mains across irrigation, pool and spa, commercial plumbing, and light industrial systems. Three-quarter inch NPT is the standard connection size across the broadest range of standard commercial and residential control valves, ball valves, gate valves, solenoid valve inlets, flow meters, and equipment connection nozzles. Wherever a 1" Schedule 40 cemented pipe run must supply any of these 3/4"-ported components at a branch position, the 402-131 bridges the run-to-branch size reduction and the socket-to-thread interface simultaneously in a single fitting body.

This is the first 402-series entry at the 1" run size. The 402-series framework established across the 2" run sub-group (402-020 equal tee and 402-247 through 402-251 reducing tees) carries forward to the 1" run sub-group consistently: dual ASTM citation (D2466 for the slip run ports, D2464 for the threaded branch), mixed-connection single-fitting efficiency narrative, FPT branch serviceability advantage, and medium-body cement guidance at the larger socket sizes. At 1" run ports, standard-body solvent cement applies rather than the medium-body specification used at 2" run sockets.

As with all 402-series mixed-connection fittings, the slip run ports form permanent solvent-cemented joints with the 1" PVC main while the 3/4" FPT branch retains the inherent serviceability of a threaded connection — the branch component can be removed and replaced without cutting into the cemented pipe system, preserving maintenance access at valve bodies, flow meters, strainer inlets, and equipment connections throughout the service life of the installation.

The 402-131 is also the Schedule 40 counterpart to the Schedule 80 mixed-connection tee family at 1" run. The 802-130 (Schedule 80, 1" × 1" × 1/2" Slip × Slip × FPT, previously written) serves the same mixed-connection function at a 1/2" FPT branch in dark gray Schedule 80 PVC. The 402-131 serves the 3/4" FPT branch size at the same 1" run in white Schedule 40 PVC — correct for Schedule 40 systems where the lower pressure rating is sufficient for the application.

Manufactured in white Schedule 40 PVC, this tee delivers reliable performance across residential, commercial, and light industrial piping applications. PVC's resistance to acids, bases, salts, chlorine, and common process fluids provides long service life where metal tees would corrode, scale, or seize on threads. NSF/ANSI 61 and NSF/ANSI 14 listings confirm suitability for potable water contact.

Rated to 450 psi at 73°F (governed by the 1" slip run ports), this fitting handles standard pressure service across irrigation, pool and spa, commercial plumbing, water treatment, and light industrial applications at 1". For the slip socket run ports, clean and dry both pipe ends and socket interiors before application. Apply purple PVC primer to all mating surfaces, then apply a uniform coat of Schedule 40 PVC solvent cement to both the pipe end and socket interior at each run port joint before inserting. Insert each pipe with a slight quarter-turn twist and hold firmly for 30 seconds. Stagger the two run port joints where possible and allow full cure time per the cement manufacturer's temperature and humidity guidelines before pressurizing. Apply PTFE tape or compatible thread sealant to all male threads engaging the 3/4" FPT branch before installing downstream components. Hand-tighten plus one to two turns — do not over-torque PVC female threads at the branch. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Commercial & Residential Irrigation — Taps a reducing 3/4" female-threaded branch off a 1" solvent-cemented Schedule 40 PVC lateral or submain at valve station positions where 3/4" MPT-ported ball valves, gate valves, solenoid valves, and flow control valves must branch off the 1" main — the defining high-frequency application for the 402-131 given the prevalence of 3/4" NPT-ported irrigation control components and the common 1" lateral pipe size in residential and commercial irrigation systems; eliminates the separate reducing bushing that a full-size 1" FPT tee would require at the 3/4" valve connection
• Pool, Spa & Aquaculture — Provides a 3/4" female-threaded branch off a 1" solvent-cemented Schedule 40 PVC recirculation or equipment header at valve body connections, filter head inlet ports, pump port branches, and equipment nozzle connections in residential and commercial pool and spa installations where 3/4" MPT-ported equipment components branch off the 1" primary piping
• Commercial Plumbing — Taps a reducing 3/4" female-threaded branch off a 1" solvent-welded Schedule 40 PVC water supply main at shutoff valve connections, pressure gauge assemblies, equipment supply branch points, and backflow preventer inlets in commercial building water distribution and mechanical room systems where the 3/4" MPT-ported branch component interfaces with the 1" cemented main at a single fitting position
• Pump Station & Equipment Connections — Provides a 3/4" female-threaded branch off a 1" solvent-cemented Schedule 40 PVC pump discharge or suction distribution run at strainer body branches, flow meter inlets, valve body connections, and equipment nozzle branches in residential and commercial pump station and mechanical equipment pad assemblies where the 3/4"-ported equipment component must branch off the 1" cemented main
• Water & Wastewater Treatment — Installs a reducing 3/4" FPT branch off a 1" solvent-welded Schedule 40 PVC distribution header at valve connections, strainer body branches, flow meter positions, sampling valve connections, and instrument isolation branches in light-duty municipal and industrial water treatment facilities where 3/4" MPT-ported downstream components interface with the 1" cemented distribution main
• Light Industrial Process Piping — Provides a reducing 3/4" female-threaded branch off a 1" solvent-welded Schedule 40 PVC process distribution header at valve connections, strainer body inlets, flow meter branches, and equipment nozzle connections in light industrial and chemical handling systems where 3/4" MPT-ported process components interface with the 1" cemented main in a single compact mixed-connection fitting
• Site Utilities & Distribution — Taps a 3/4" female-threaded valve, meter, or equipment connection off a 1" solvent-welded Schedule 40 PVC site utility distribution main at isolation valve branches, hose bib connections, equipment supply positions, and secondary distribution takeoffs throughout commercial site water distribution systems where 3/4" NPT-ported components must branch off the 1" primary distribution piping