Reducer Bushing, Spigot x FPT PVC Schedule 40 1-1/4" x 1" (438-168)

This 1-1/4" x 1" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact mixed-connection near-full-size transition from a 1-1/4" socket fitting hub down to a 1" female NPT-threaded outlet, consolidating a very modest 1.25:1 diameter reduction and a socket-to-thread material transition into a single fitting body — the least aggressive confirmed reduction in the 1-1/4" spigot inlet 438 sub-series and driven almost entirely by the need to match a 1" 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" male-threaded valve, pump port, filter housing, zone valve, or equipment connection must be installed directly at a 1-1/4" socket assembly port location without a separate hex bushing, inline reducer coupling, or multi-piece transition assembly.

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 1" FPT interior accepts any standard 1" 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 1-1/4" assembly is an all-socket PVC system and the downstream component is a 1" male-threaded fitting or device — distinct from the 439-168 (1-1/4" x 1" 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 1" size combination and represents the sixth 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 1" if stocked), which provides a 1" socket outlet for continuing a cemented PVC pipe run rather than connecting a male-threaded component, or with the adjacent 438-167 (1-1/4" x 3/4" Spigot x FPT), which serves moderate-bore zone valve and service component connections at the smaller 3/4" outlet. The 1-1/4" to 1" near-full-size transition is most commonly encountered at 1-1/4" socket tee branch outlets, cross ports, and manifold hubs where 1" threaded zone valves, pump inlets, filter housing connections, and high-demand service components must be served directly off the fitting hub — preserving very high flow capacity through the 1" outlet while accomplishing the socket-to-thread transition in a single compact fitting body at the same location.

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 1" 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" male-threaded zone control valves, pump inlets, filter housing connections, and high-demand service taps directly at 1-1/4" socket tee branches, cross ports, and manifold hubs in residential, agricultural, and municipal irrigation systems where 1" threaded downstream components requiring near-full flow capacity must interface with 1-1/4" socket assembly ports at valve station and distribution manifold locations
• Commercial Plumbing — Incorporates 1" male-threaded branch service connections, valve inlets, backflow preventer ports, and high-flow equipment feed connections directly at 1-1/4" socket fitting hub outlets in commercial building water distribution systems where near-full-size 1" 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 1" male-threaded pump inlets, valve bodies, flow meters, and moderate-bore equipment connections in water treatment, chemical processing, and manufacturing facilities where near-full-size all-socket-to-threaded transitions at 1-1/4" socket ports serve high-demand 1" threaded downstream service components
• Chemical Handling — Delivers a corrosion-resistant near-full-size 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 1" male-threaded valve bodies, pump inlets, and high-capacity chemical feed components must be connected directly 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 1" male-threaded pump inlets, filter housing connections, and high-demand 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 1" male-threaded pump connections, high-flow valve inlets, and service components on cooling tower supply headers, chilled water distribution manifolds, and chemically treated water system socket assemblies within the Schedule 40 pressure class