Reducer Bushing, Spigot x FPT PVC Schedule 40 1-1/4" x 3/4" (438-167)

This 1-1/4" x 3/4" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact mixed-connection transition from a 1-1/4" socket fitting hub down to a 3/4" female NPT-threaded outlet, consolidating a moderate 1.67:1 diameter reduction and a socket-to-thread material transition into a single fitting body without the need for a separate inline reducer coupling, hex bushing, or multi-piece transition assembly. Constructed in white Schedule 40 PVC, it offers reliable performance in commercial plumbing, irrigation, and light industrial installations where a 3/4" male-threaded service component, zone valve, solenoid valve inlet, filter housing connection, or full-service branch fitting must be installed directly at a 1-1/4" socket assembly port location.

The 1-1/4" spigot (male plain end) is sized to insert directly into the hub of any standard 1-1/4" 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 3/4" FPT interior accepts any standard 3/4" male NPT-threaded fitting, valve, nipple, zone valve, solenoid inlet, or service component 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 1-1/4" assembly is an all-socket PVC system and the downstream component at the branch or port location is a 3/4" male-threaded fitting or device — distinct from the 439-167 (1-1/4" x 3/4" MPT x FPT Hex Bushing, confirmed in this catalog session), which threads into a 1-1/4" female-threaded port rather than cementing into a 1-1/4" socket hub; this inlet-type distinction is the sole differentiator between these two confirmed fittings at the identical 1-1/4" x 3/4" size combination and represents the fifth confirmed case in this catalog session of a parallel 438/439 same-size pair. It should also not be confused with any 437 series all-slip counterpart at this size (Spigot x Slip, 1-1/4" x 3/4" if stocked), which provides a 3/4" socket outlet for continuing a cemented PVC pipe run rather than connecting a male-threaded service component, or with the adjacent 1-1/2" inlet parallel (438-210, 1-1/2" x 3/4" Spigot x FPT) or 2" inlet parallel (438-248, 2" x 3/4" Spigot x FPT). The 1-1/4" to 3/4" step-down most commonly appears at 1-1/4" socket tee branch outlets, cross ports, and manifold hubs where 3/4" threaded zone valves, solenoid valve inlets, filter housing connections, and full-service branch components must be served directly off a 1-1/4" socket assembly without an intermediate adapter assembly.

Rated to approximately 370 psi at 73°F (governed by the 1-1/4" 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 1-1/4" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. On the 3/4" 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 3/4" male-threaded zone control valves, solenoid valve inlets, filter housing connections, and full-service branch taps directly at 1-1/4" socket tee branches, cross ports, and manifold hubs in residential, agricultural, and municipal irrigation systems where 3/4" threaded downstream components must interface with 1-1/4" socket assembly ports at valve station and distribution manifold locations without a separate hex bushing or adapter assembly
• Commercial Plumbing — Incorporates 3/4" male-threaded branch service connections, valve inlets, backflow preventer ports, and equipment feed connections directly at 1-1/4" socket fitting hub outlets in commercial building water distribution systems where moderate-flow 3/4" threaded service components must be served off 1-1/4" socket assembly ports without an intermediate threaded transition fitting
• Industrial Process Piping — Transitions 1-1/4" socket fitting hub branch outlets and manifold ports to 3/4" male-threaded instrument connections, sampling valves, chemical injection ports, and service branch components in water treatment, chemical processing, and manufacturing facilities where 3/4" threaded downstream service components must be tapped directly off 1-1/4" socket assembly ports
• Chemical Handling — Delivers a corrosion-resistant mixed-connection socket-to-thread transition at 1-1/4" socket fitting hub ports in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, where 3/4" male-threaded valve bodies, solenoid inlets, and moderate-bore chemical feed components must be connected at socket assembly ports without metal adapter chains
• Water Treatment & Aquaculture — Used at 1-1/4" socket tee branches, cross ports, and manifold hub outlets where 3/4" male-threaded zone valves, filter housing connections, and treatment equipment ports must be incorporated directly at socket fitting locations with NSF/ANSI 61 compliance required throughout the assembly
• HVAC & Mechanical Systems — Transitions 1-1/4" socket fitting hub ports to 3/4" male-threaded pump connections, valve inlets, and moderate-flow service components on cooling tower supply headers, chilled water distribution manifolds, and chemically treated water system socket assemblies within the Schedule 40 pressure class