Reducing Tee, Slip x Slip x Slip PVC Schedule 40 1-1/4" x 1 x 3/4" (401-157)

This 1-1/4" x 1" x 3/4" Schedule 40 PVC Reducing Tee (Slip x Slip x Slip) combines an inline run reduction and a perpendicular service branch tap into a single all solvent-cement fitting body — accepting 1-1/4" PVC pipe at the run inlet socket for a permanent solvent-cement bond, continuing the inline run at a reduced 1" socket outlet for a permanent solvent-cement bond to the downstream 1" pipe run, and providing a 3/4" slip socket branch outlet for a permanent solvent-cement bond to a 3/4" service run departing perpendicular to the inline axis. Constructed in white Schedule 40 PVC, it eliminates the separate full-size 1-1/4" tee, separate inline reducer coupling, and separate spigot bushing or reducer at the branch that a multi-fitting approach would require at the same assembly location.

The 1-1/4" slip socket run inlet accepts 1-1/4" PVC pipe for a permanent solvent-cement bond from the upstream distribution assembly. The 1" slip socket run outlet accepts 1" PVC pipe for a permanent solvent-cement bond on the continuing downstream reduced-diameter inline run — stepping the run diameter down from 1-1/4" to 1" through the fitting body while maintaining inline continuity. The 3/4" slip socket branch outlet accepts 3/4" PVC pipe for a permanent solvent-cement bond on a dedicated service run, lateral supply stub, or zone distribution run departing at right angles from the inline run axis — providing a 3/4" all-socket branch tap simultaneously with the inline run step-down in a single compact fitting body. This configuration is the correct choice when three conditions must be met simultaneously at the same assembly point: a 1-1/4" socket pipe run upstream, an inline run step-down to 1" socket at the tee location, and a 3/4" socket branch service run departing perpendicular to the inline run. This entry is the direct smaller-branch parallel to the confirmed 401-158 (1-1/4" x 1" x 1", confirmed in this catalog session) — both share the same 1-1/4" to 1" inline run-reducing combination but differ in branch outlet size; 401-157 is the correct choice when the downstream branch must continue as a 3/4" socket pipe run, while 401-158 is correct when the branch must continue at 1" socket. At the 1-1/4" x 1" x 3/4" combination, this tee most commonly appears in commercial irrigation sub-main assemblies where a 1-1/4" sub-main must simultaneously step down to a continuing 1" inline secondary distribution run and supply a 3/4" socket zone lateral or service branch; in commercial plumbing distribution assemblies where a 1-1/4" socket header must simultaneously reduce inline to 1" and supply a 3/4" socket dedicated fixture or equipment service branch; and in pump station socket distribution assemblies where a 1-1/4" socket run must simultaneously step down and supply a 3/4" socket bypass, instrument approach, or service branch at the inline transition point.

Rated to approximately 370 psi at 73°F (governed by the 1-1/4" slip run inlet), this tee is suited for standard commercial and light industrial pressure service. 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 — note that all three slip ports are different diameters (1-1/4" inlet, 1" outlet, 3/4" branch); confirm pipe diameters carefully before cementing each joint to avoid inserting the incorrect pipe size into any port. Insert pipe fully into each socket and maintain a quarter-turn during assembly for even cement distribution. Allow adequate cure time before pressurizing, and derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Irrigation & Water Distribution — Simultaneously steps down a 1-1/4" all-socket sub-main or secondary distribution run to a continuing 1" socket inline secondary header and taps a 3/4" socket zone lateral, service branch, or zone supply stub at the inline transition point in residential, light commercial, and agricultural irrigation systems where the run step-down and branch tap must occur at the same compact fitting location without a multi-fitting assembly in the all-socket distribution layout
• Commercial Plumbing — Provides a combined inline run reduction and 3/4" socket service branch tap at 1-1/4" to 1" distribution header transition points in commercial building water supply systems where a dedicated 3/4" socket fixture supply, equipment feed, or small-bore service branch must be incorporated at the same inline step-down location without additional intermediate fittings in the all-socket distribution assembly
• Pump Station Assemblies — Simultaneously steps down a 1-1/4" socket pump station distribution run to a continuing 1" socket secondary supply or bypass line and taps a 3/4" socket instrument approach, bypass service, or dedicated service branch at the inline transition point in pump station socket piping where fitting count reduction at inline step-down and branch locations is a design priority
• Industrial Process Piping — Reduces a 1-1/4" all-socket process water distribution run to a continuing 1" socket secondary header while simultaneously tapping a 3/4" socket instrument supply, dedicated equipment approach, or small-bore service branch at the inline reduction point in water treatment, chemical processing, and manufacturing facilities where all-socket Schedule 40 PVC construction is maintained throughout
• Water Treatment & Aquaculture — Used at inline 1-1/4" to 1" all-socket transition points where a 3/4" socket chemical dosing supply branch, instrument approach run, or dedicated service lateral must be incorporated at the run step-down fitting location with NSF/ANSI 61 compliance required throughout the all-cemented assembly
• Drip & Micro-Irrigation Systems — Steps down a 1-1/4" socket distribution header to a continuing 1" socket inline secondary supply while tapping a 3/4" socket drip emitter supply lateral, micro-irrigation sub-header, or dedicated zone supply stub at the inline reduction point in drip and micro-irrigation distribution layouts where the three-port all-socket fitting eliminates multiple separate fittings at the same transition and branch location