Reducing Tee, Slip x Slip x FPT PVC Schedule 40 2" x 2" x 1-1/2" (402-251)

This 2" × 1-1/2" Schedule 40 PVC Reducing Tee provides the minimal one-step reducing branch connection in the 402-series 2" run sub-group — a single adjacent-size step from a 2" solvent-cemented PVC run down to a 1-1/2" female NPT threaded branch outlet in a single fitting. The two 2" slip socket run ports accept standard 2" PVC pipe for solvent cement joining along the through-run, while the 1-1/2" FPT branch outlet receives any compatible 1-1/2" male-threaded fitting, valve, pump port, strainer body, filter vessel inlet, or equipment connection at the branch position without additional adapters or reducing components at the branch face.

Within the 402-series 2" run sub-group, the 402-251 occupies the position closest to the equal tee — the 1-1/2" branch is the largest branch outlet among all six entries and requires only a single minimal size step from the 2" run. This positioning defines both the application context and the selection logic for this fitting. The complete five-entry selection guide for the reducing sub-group is straightforward by branch outlet size: a 1-1/2" MPT branch component calls for the 402-251; a 1-1/4" MPT branch calls for the 402-250; a 1" MPT branch calls for the 402-249; a 3/4" MPT branch calls for the 402-248; and a 1/2" MPT branch calls for the 402-247. The 402-251 is the correct selection whenever the downstream component at the branch presents a 1-1/2" male-threaded inlet — a common port size given the prevalence of 1-1/2" NPT across standard valve bodies, pump discharge and suction ports, strainer body connections, filter vessel inlets, and primary distribution equipment throughout commercial and industrial systems.

The 1-1/2" FPT branch serves a meaningfully broader component population than the 1-1/4" branch of the 402-250. Where 1-1/4" NPT is a transitional size that appears at specific pump and equipment connection positions, 1-1/2" NPT is a standard primary connection size encountered across a much wider range of valve types, pump configurations, strainer bodies, filter vessel connections, and distribution equipment in commercial irrigation, commercial plumbing, water treatment, and light industrial systems. The 402-251 reaches this broader 1-1/2"-ported component population from the 2" cemented main with the minimal one-step size reduction — making it the highest-frequency SKU in the reducing sub-group alongside the 402-249 at 1".

The minimal one-step reduction from 2" to 1-1/2" also produces the smoothest possible hydraulic branch transition in the reducing sub-group. The small size differential between the 2" run and the 1-1/2" branch minimizes velocity change at the branch entry point — an advantage in pump suction branch connections, primary distribution takeoffs, filter vessel inlet branches, and any flow-sensitive branch position where pressure drop minimization and hydraulic continuity at the branch junction are design considerations alongside the connection-type requirements.

Selecting the 402-251 over the 402-020 equal tee requires a clear understanding of the branch component's NPT port size. When the branch component presents a 2" male-threaded inlet, the equal tee provides the most direct connection without any size reduction at the branch. When the branch component presents a 1-1/2" male-threaded inlet — as it does for the large population of 1-1/2" NPT valves, pump ports, strainer bodies, and equipment connections throughout standard systems — the 402-251 reduces the branch to the correct connection size at the tee body itself, eliminating the intermediate reducing bushing that an equal 2" FPT tee would require to achieve the same 1-1/2" branch connection.

As with all 402-series mixed-connection fittings, the slip run ports form permanent solvent-cemented joints with the 2" PVC main while the 1-1/2" FPT branch retains the inherent serviceability of a threaded connection. The branch component — valve body, pump port adapter, strainer, or filter vessel inlet — can be removed and replaced without cutting into the cemented pipe system, preserving full maintenance access at the branch position throughout the service life of the installation.

Manufactured in white Schedule 40 PVC, this tee delivers reliable performance across commercial, light industrial, and residential 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 280 psi at 73°F (governed by the 2" slip run ports), this fitting handles standard pressure service across irrigation, commercial plumbing, pool and spa, water treatment, and light industrial applications at 2". 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 medium-body 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 guidelines before pressurizing. Apply PTFE tape or compatible thread sealant to all male threads engaging the 1-1/2" 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 & Municipal Irrigation — Taps a minimal one-step 1-1/2" female-threaded branch off a 2" solvent-cemented Schedule 40 PVC mainline or submain at primary valve station positions, filter station inlet connections, pump station branch ports, and major equipment connections where 1-1/2" MPT-ported ball valves, gate valves, strainer bodies, and filter vessel inlets must branch off the 2" main at close-to-run-capacity branch flow rates that approach but fall below the full 2" flow requirement
• Pump & Equipment Branch Connections — Provides a 1-1/2" female-threaded branch off a 2" solvent-cemented Schedule 40 PVC main at pump suction and discharge port connections, strainer body inlet branches, filter vessel inlet connections, and primary equipment nozzle branches where the downstream component presents a 1-1/2" MPT inlet — the most prevalent application for the 402-251 given the widespread use of 1-1/2" NPT as a standard pump and equipment port size in commercial systems
• Commercial Plumbing — Provides a minimal one-step reducing 1-1/2" female-threaded branch off a 2" solvent-welded Schedule 40 PVC water supply main at primary shutoff valve connections, pressure zone branch points, equipment supply manifold connections, and secondary distribution header feeds in commercial building water distribution systems where the 1-1/2" branch serves high-capacity branch flow requirements just below the full 2" run capacity
• Pool, Spa & Aquaculture — Taps a 1-1/2" female-threaded branch off a 2" solvent-cemented Schedule 40 PVC recirculation main or primary equipment header at pump suction and discharge branches, filter vessel inlet connections, major valve body positions, and secondary equipment supply branches in commercial pool, spa, and aquatic facility installations where 1-1/2" MPT-ported equipment components branch off the 2" primary piping at close-to-run-capacity branch positions
• Water & Wastewater Treatment — Installs a minimal one-step 1-1/2" FPT reducing branch off a 2" solvent-welded Schedule 40 PVC distribution header at pump connection branches, primary filter vessel inlet positions, secondary distribution supply takeoffs, isolation valve branches, and major equipment connections in municipal and industrial water treatment facilities where the 1-1/2" branch pipe size serves primary branch flow requirements just below the 2" run capacity
• Light Industrial Process Piping — Provides a minimal reducing 1-1/2" female-threaded branch off a 2" solvent-welded Schedule 40 PVC process distribution header at pump connections, strainer body inlets, filter vessel branches, and primary equipment supply connections in light industrial and chemical handling systems where 1-1/2" MPT-ported process components interface with the 2" cemented main at high-capacity branch positions
• Site Utilities & Primary Distribution — Taps a 1-1/2" female-threaded primary valve, pump, or equipment connection off a 2" solvent-welded Schedule 40 PVC site utility water distribution main at primary isolation valve branches, major equipment supply connections, and secondary distribution header feed positions throughout commercial site water distribution systems where the 1-1/2" branch serves near-full-capacity branch flow requirements off the 2" primary distribution main