Reducing Tee, Slip x Slip x Slip PVC Schedule 40 1" x 3/4" x 1/2" (401-124)

This 1" × 3/4" × 1/2" Schedule 40 PVC Reducing Tee accomplishes three functions simultaneously in a single all-socket fitting: it joins the incoming 1" pipe run at the inlet, transitions the continuing run down to a 3/4" outlet, and provides a 1/2" branch takeoff perpendicular to the run — all in a single solvent-cemented fitting body. The 1" slip socket accepts the primary inlet pipe, the 3/4" slip socket continues the run at the reduced diameter, and the 1/2" slip socket provides the branch outlet, with all three ends accepting their respective PVC pipe sizes for solvent cement joining.

The all-different-size configuration of the 401-124 is the defining characteristic that distinguishes it from every other tee in this catalog. All previously written tees — equal tees (401-015, 801-007, 801-010) and standard reducing tees (801-131) — share one common feature: the two run ports are the same size. Whether the tee is an equal tee where all three ends match or a standard reducing tee where the branch is smaller than equal-size run ports, the run ports themselves are always the same diameter. The 401-124 breaks this convention entirely — the run inlet is 1", the run outlet is 3/4", and the branch is 1/2". No two ends are the same size.

This geometry means the 401-124 accomplishes two size reductions simultaneously rather than one. Along the run, the pipe transitions from 1" on the inlet side to 3/4" on the outlet side — an inline one-step size reduction that, in any other fitting configuration, would require a separate reducer coupling at this position. At the branch, the pipe exits at 1/2" — a two-step reduction from the 1" inlet, or a one-step reduction from the 3/4" run outlet. A standard 1" × 1" × 1/2" reducing tee would maintain the 1" run diameter through the tee while branching at 1/2"; a standard 1" reducer coupling would step down the run from 1" to 3/4" without providing any branch. The 401-124 eliminates the need for both — delivering the run size change and the branch connection at the same fitting body in a single compact assembly.

The practical efficiency of the all-different-size reducing tee is most pronounced in irrigation systems, where this fitting configuration addresses one of the most common layout requirements. A 1" lateral or submain must feed a 3/4" zone supply run while simultaneously tapping a 1/2" branch for a secondary zone connection, instrument supply, or solenoid valve at the same tee position. In the absence of the 401-124, this three-function requirement would demand a standard tee plus separate reducing couplings at the branch and run outlet positions — two or more additional fittings and joints that the single 401-124 body eliminates. Compact valve box assemblies, manifold cluster positions, and inline distribution points in commercial irrigation layouts where space and joint count minimization are practical objectives benefit directly from this fitting's combined function.

Pool and spa system distribution piping presents the same combined requirement at slightly different pipe sizes. When a 1" primary supply run must step down to a 3/4" equipment feed while tapping a 1/2" chemical dosing or instrument connection at the same position, the 401-124 accomplishes all three functions — inlet run continuity at 1", run reduction to 3/4", and branch at 1/2" — without splitting the requirement across multiple fittings.

The installation geometry of the 401-124 requires careful planning before any cement is applied. The fitting has three distinct socket sizes, all different, and the spatial orientation of all three must be confirmed before the first joint is committed. The 1" socket must receive the larger-diameter incoming pipe run; the 3/4" socket must face the smaller-diameter run continuation; the 1/2" socket must face the branch direction. These orientations cannot be adjusted after any joint is cemented. A thorough dry-fit assembly — aligning all three pipes in their correct positions and confirming the three-dimensional layout of the assembly before any primer or cement is applied — is essential and non-negotiable for a fitting with three different socket sizes all set permanently at installation.

The governing-end pressure rating follows the standard principle that the largest bore carries the lowest pressure rating. At the 401-124, the 1" inlet socket is the largest end and governs the assembly at approximately 450 psi at 73°F — the same rating as a standard 1" Schedule 40 fitting. The 3/4" and 1/2" sockets would individually carry higher pressure ratings at their respective bore sizes, but the assembly is governed by the 1" inlet throughout.

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 or scale. 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" inlet socket), this fitting handles standard pressure service across irrigation, commercial plumbing, pool and spa, water treatment, and light industrial applications. Three separate solvent-cemented joints must be made at installation. Clean and dry each pipe end and socket interior before application. Apply purple PVC primer to all mating surfaces — the 1" socket and pipe end, the 3/4" socket and pipe end, and the 1/2" socket and pipe end. Apply a uniform coat of Schedule 40 PVC solvent cement to both the pipe end and socket interior at each joint before inserting. Insert each pipe with a slight quarter-turn twist and hold firmly for 30 seconds. Confirm that the correct pipe size is aligned to each socket before cementing any joint — the 1", 3/4", and 1/2" sockets are all different and must each receive their correct pipe size; this cannot be corrected after the cement cures. Complete the dry-fit assembly and verify all three spatial orientations before applying primer. Stagger the three joints where possible and allow full cure time per the cement manufacturer's guidelines before pressurizing. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Irrigation Distribution & Zone Supply — The defining application for the all-different-size reducing tee: simultaneously reduces a 1" irrigation lateral or submain to a 3/4" zone supply continuation while tapping a 1/2" secondary branch for an additional zone, instrument supply, solenoid valve, or flow monitoring connection — accomplishing what would otherwise require a standard reducing tee plus a separate reducer coupling at the run outlet in a single compact fitting body at the tee position
• Commercial & Residential Irrigation Manifolds — Provides an inline run size reduction from 1" to 3/4" and a simultaneous 1/2" branch at valve box manifold positions, pump station distribution tees, and inline distribution cluster positions in commercial and residential irrigation systems where compact fitting assemblies within valve boxes and manifold enclosures benefit from the single-fitting efficiency of the all-different-size reducing tee over a two-fitting equivalent assembly
• Pool, Spa & Aquaculture Distribution — Reduces a 1" Schedule 40 PVC pool or spa supply run to a 3/4" equipment feed continuation while simultaneously tapping a 1/2" chemical dosing connection, pressure gauge port, or instrument supply branch in residential and commercial pool and spa equipment pad piping where the combined run reduction and branch function at the same fitting position reduces fitting count and simplifies the equipment pad layout
• Commercial Plumbing Distribution — Transitions a 1" Schedule 40 PVC secondary distribution main to a 3/4" branch supply continuation while tapping a 1/2" fixture supply, equipment feed, or instrument connection at the same tee position in commercial building water distribution and mechanical room systems where the three-function fitting reduces total joint count at complex distribution cluster positions
• Water & Wastewater Treatment — Reduces a 1" Schedule 40 PVC process distribution line to a 3/4" secondary header continuation while tapping a 1/2" instrument supply, sampling connection, or chemical dosing branch at process header distribution positions in light-duty municipal and industrial water treatment facilities where the combined run reduction and branch provides three-function coverage at a single fitting position
• Pump Station Distribution & Secondary Headers — Provides inline run reduction from 1" to 3/4" and a simultaneous 1/2" secondary branch at pump station outlet distribution positions, equipment supply header tee positions, and secondary distribution split points in residential and commercial pump station assemblies where the three-size fitting accomplishes run step-down and branch simultaneously at equipment connection cluster positions
• Light Industrial Process Piping — Combines an inline 1"-to-3/4" run size reduction with a 1/2" branch takeoff at process distribution cluster positions in light industrial and chemical handling Schedule 40 systems where the three-function fitting reduces the component count at points in the process distribution layout where both a run size transition and a branch connection are required simultaneously