Reducing Tee, Slip x Slip x Slip PVC Schedule 40 1" x 1" x 3/4" (401-131)

This 1" x 1" x 3/4" Schedule 40 PVC Reducing Tee (Slip x Slip x Slip) provides a three-way all solvent-cement junction that maintains a continuous 1" socket inline run while tapping a reduced 3/4" socket branch perpendicular to the run — the most common mainline-to-lateral branch size step in residential and light commercial irrigation systems and one of the most widely specified reducing tee configurations in the Schedule 40 PVC socket fitting catalog. Constructed in white Schedule 40 PVC, it offers reliable performance across irrigation, commercial plumbing, fire suppression, and light industrial applications where a 3/4" socket branch must be tapped off a 1" mainline run without interrupting mainline flow capacity at the tee location.

Both 1" slip socket run ends accept 1" PVC pipe for permanent solvent-cement bonds, maintaining the full 1" mainline diameter through the tee body on the inline run. The 3/4" slip socket branch accepts 3/4" PVC pipe for a permanent solvent-cement bond perpendicular to the run, providing a 3/4" lateral tap at the tee location. This 1.33:1 modest branch reduction is the most common single-step branch size decrease at the 1" run diameter — driven almost entirely by the need to supply a 3/4" downstream lateral or service run from a 1" distribution mainline rather than by any significant hydraulic flow management requirement. The 3/4" branch is the most widely specified lateral and zone distribution pipe size in residential and light commercial irrigation systems, making 401-131 the natural tee choice at every location along a 1" irrigation mainline where a 3/4" lateral zone run, a 3/4" grid header branch, or a 3/4" service tap must depart from the continuing 1" supply main. This fitting should not be confused with the parallel 402 series mixed-connection counterpart (402 series, 1" x 1" x 3/4" Slip x Slip x FPT if stocked), which provides a 3/4" female-threaded branch for connecting a 3/4" male-threaded downstream component rather than a 3/4" socket pipe run; the 401-131 is the all-socket choice for continuing a 3/4" cemented PVC pipe run while the 402 series counterpart is the correct choice when the 3/4" branch must connect to a threaded valve, solenoid, or fitting. At the most widely specified lateral tap configuration in residential irrigation, the 401-131 is also commonly used in commercial plumbing branch supply distribution at window and wall penetration points where 1" supply mains tap 3/4" dedicated fixture supply runs, in fire suppression grid-layout headers where 1" mains tap 3/4" branch laterals, and in light industrial process water distribution where 1" headers supply 3/4" equipment or zone service runs.

Rated to approximately 450 psi at 73°F (governed by the 1" slip run ends), this tee is suited for standard commercial and light industrial pressure service. Its PVC composition provides excellent resistance to corrosion, scale, chlorinated water, and a broad range of chemical exposures. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to both the pipe end and fitting socket at each port per ASTM D2564 procedures, using a primer appropriate for the pipe and fitting schedule. Insert pipe fully into each socket and maintain a quarter-turn during assembly for even cement distribution. Allow adequate cure time before pressurizing the system, and derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Irrigation & Water Distribution — Taps 3/4" socket lateral zone runs, grid header branches, and dedicated service lines directly off 1" socket irrigation mainline pipe runs at zone departure points, header intersection locations, and lateral distribution tap points in residential and light commercial irrigation systems — the single most common mainline-to-lateral branch size step in North American residential irrigation and the dominant application for this fitting across all system types and installation scales
• Commercial Plumbing — Provides 3/4" socket branch supply taps off 1" socket distribution mains at dedicated fixture supply runs, branch supply departure points, and service line connection locations in commercial building water distribution systems where the 1" supply main must supply 3/4" socket branches to individual fixture groups, equipment feeds, and zone supply runs throughout the building distribution layout
• Fire Suppression Systems — Taps 3/4" socket branch laterals and drop supply runs off 1" socket grid headers in light-hazard and residential Schedule 40 PVC fire suppression systems where the 1" grid main must supply 3/4" branch drop runs to individual sprinkler heads and lateral distribution branches throughout the suppression grid
• Industrial Process Piping — Provides 3/4" socket service branch taps off 1" process water distribution headers, equipment feed mains, and cooling water distribution runs in water treatment, chemical processing, and manufacturing facilities where the 1" distribution header must supply 3/4" socket dedicated equipment, zone, or instrument service runs at multiple tap points throughout the facility
• Chemical Handling — Delivers a corrosion-resistant all-socket 3/4" branch tap off 1" chemical distribution headers, feed line mains, and dosing system supply runs in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, at lateral tap and zone departure points throughout the all-cemented chemical distribution assembly
• Water Treatment & Aquaculture — Used at lateral tap points, zone departure branches, and equipment supply connection locations on 1" socket distribution headers and recirculating system mains where a 3/4" socket branch must be tapped off the 1" mainline run with NSF/ANSI 61 compliance required throughout the all-socket assembly