Reducer Bushing, Spigot x FPT PVC Schedule 40 2" x 1-1/2" (438-251)

This 2" x 1-1/2" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact mixed-connection near-full-size transition from a 2" socket fitting hub down to a 1-1/2" female NPT-threaded outlet, consolidating a modest 1.33:1 diameter reduction and a socket-to-thread material transition into a single fitting body — the least aggressive confirmed reduction in the 2" inlet 438 sub-series and driven almost entirely by the need to match a 1-1/2" threaded downstream component rather than by any hydraulic flow management requirement. Constructed in white Schedule 40 PVC, it offers reliable performance in commercial plumbing, irrigation, and light industrial installations where a 1-1/2" male-threaded valve, pump port, filter housing, or high-flow equipment connection must be installed directly at a 2" socket assembly port location without a separate hex bushing, inline reducer coupling, or multi-piece transition assembly.

The 2" spigot (male plain end) is sized to insert directly into the hub of any standard 2" socket-end fitting — tee branch outlet, cross port, coupling end, elbow outlet, or valve body — and is solvent-cemented in place to form a permanent, leak-free joint at the outer face of the hub. The 1-1/2" FPT interior accepts any standard 1-1/2" male NPT-threaded fitting, valve, nipple, pump port, or equipment connection for a pressure-tight mechanical connection when made up with thread sealant or PTFE tape. This Spigot x FPT mixed-connection configuration is the correct choice when the upstream 2" assembly is an all-socket PVC system and the downstream component is a 1-1/2" male-threaded fitting or device — distinct from the 439-251 (2" x 1-1/2" MPT x FPT Hex Bushing, confirmed in this catalog session), which threads into a 2" female-threaded port rather than cementing into a 2" socket hub, and from any 437 series all-slip counterpart at this size (Spigot x Slip, 2" x 1-1/2" if stocked), which provides a 1-1/2" socket outlet for a cemented pipe run rather than a threaded component connection. The 1-1/2" FPT outlet is among the most widely specified threaded connection sizes for zone valves, pump stations, filter housing connections, and high-flow equipment ports in commercial plumbing and irrigation systems — making 438-251 the highest-flow, nearest-full-size confirmed entry in the 2" inlet 438 sub-series and the appropriate choice wherever a large-diameter 2" socket assembly must serve a high-demand 1-1/2" threaded downstream component at tee branches, cross ports, or manifold hub locations without an intermediate transition assembly.

Rated to approximately 280 psi at 73°F (governed by the 2" spigot end), this bushing is suited for standard commercial and light industrial water distribution and irrigation service within its pressure class. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to the spigot exterior and the interior of the receiving 2" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. On the 1-1/2" FPT end, use a quality pipe thread sealant or PTFE tape on the male NPT threads of the mating downstream component before engagement. Avoid over-torquing — PVC threads require hand-tight plus one to two turns. Allow adequate cure time on the cemented spigot joint before pressurizing the system, and derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Irrigation & Water Distribution — Provides 1-1/2" male-threaded high-flow zone valve inlets, pump connection ports, filter housing connections, and large-bore service taps directly at 2" socket tee branches, cross ports, and manifold hubs in agricultural and municipal irrigation systems where high-demand 1-1/2" threaded downstream components must interface with a large-diameter 2" socket mainline assembly without a separate hex bushing or multi-piece adapter transition at the port location
• Commercial Plumbing — Incorporates 1-1/2" male-threaded high-flow branch connections, valve inlets, backflow preventer ports, and equipment feed connections directly at 2" socket fitting hub outlets in commercial building water distribution systems where near-full-size 1-1/2" threaded service components require the highest confirmed branch flow capacity in the 2" inlet 438 sub-series off a large-diameter 2" socket assembly
• Industrial Process Piping — Transitions 2" socket fitting hub branch outlets and manifold ports to 1-1/2" male-threaded pump inlets, valve bodies, flow meters, and high-capacity equipment connections in water treatment, chemical processing, and manufacturing facilities where a near-full-size all-socket-to-threaded transition at 2" socket ports serves high-demand 1-1/2" threaded downstream service components throughout the distribution assembly
• Chemical Handling — Delivers a corrosion-resistant near-full-size mixed-connection socket-to-thread transition at 2" socket fitting hub ports in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, where high-flow 1-1/2" male-threaded valve bodies, pump inlets, and chemical distribution components must be connected directly at large-diameter socket assembly ports without metal adapter chains
• Water Treatment & Aquaculture — Used at 2" socket tee branches, cross ports, and manifold hub outlets where high-capacity 1-1/2" male-threaded pump inlets, filter housing connections, and treatment equipment ports must be incorporated directly at large-diameter socket fitting locations with NSF/ANSI 61 compliance required throughout the all-socket assembly
• HVAC & Mechanical Systems — Transitions 2" socket fitting hub ports to 1-1/2" male-threaded pump connections, high-flow valve inlets, and large-capacity service components on cooling tower supply headers, chilled water distribution manifolds, and chemically treated water system socket assemblies within the Schedule 40 pressure class where near-full-size socket-to-thread transitions at 2" ports serve high-demand 1-1/2" threaded downstream components