Reducer Bushing, Spigot x FPT PVC Schedule 40 1" x 3/4" (438-131)

This 1" x 3/4" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact mixed-connection near-full-size transition from a 1" socket fitting hub down to a 3/4" 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 1" spigot inlet 438 sub-series and driven almost entirely by the need to match a 3/4" 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 3/4" male-threaded zone valve, solenoid valve inlet, filter housing connection, pump port, or equipment component must be installed directly at a 1" socket assembly port location without a separate hex bushing, inline reducer coupling, or multi-piece transition assembly.

The 1" spigot (male plain end) is sized to insert directly into the hub of any standard 1" socket-end fitting — tee branch outlet, cross port, coupling end, elbow outlet, side outlet elbow port, 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, zone valve, solenoid valve inlet, 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" assembly is an all-socket PVC system and the downstream component at the hub port is a 3/4" male-threaded fitting or device — distinct from the 439-131 (1" x 3/4" MPT x FPT Hex Bushing, confirmed in this catalog session), which threads into a 1" female-threaded port rather than cementing into a 1" socket hub, and from 838-131 (1" x 3/4" Schedule 80 Spigot x FPT Bushing, confirmed in this catalog session), which is the direct Schedule 80 dark gray counterpart at the same size and connection type serving higher-pressure applications. It should also not be confused with any 437 series all-slip counterpart (Spigot x Slip, 1" x 3/4" if stocked), which provides a 3/4" socket outlet for a cemented pipe run rather than connecting a male-threaded component, or with 438-129 (1" x 3/8" Spigot x FPT, confirmed in this session), which serves the smaller-bore specific instrument and legacy service connection application at the 3/8" NPT thread size. At the 1" spigot inlet, the 3/4" FPT outlet is the most widely specified threaded service connection size — appearing throughout irrigation grid assemblies where 1" socket tee branch outlets and cross ports must serve 3/4" male-threaded zone valves and solenoid inlets; in commercial plumbing socket distribution assemblies where 3/4" threaded branch service connections must depart from 1" socket fitting hubs; and at equipment interfaces where a 1" socket main must supply a 3/4" male-threaded pump port, filter connection, or moderate-flow service component in the most compact possible single-fitting body at the socket hub.

Rated to approximately 450 psi at 73°F (governed by the 1" 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" 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" socket tee branch outlets, cross ports, and manifold hubs in residential, agricultural, and municipal irrigation systems where 3/4" threaded downstream components must interface with 1" socket assembly ports at the most common adjacent-size socket-to-threaded transition in all-socket irrigation grid assemblies
• Commercial Plumbing — Incorporates 3/4" male-threaded branch service connections, valve inlets, backflow preventer ports, and equipment feed connections directly at 1" socket fitting hub outlets in commercial building water distribution systems where moderate-flow 3/4" threaded service components must be served off 1" socket assembly ports without an intermediate threaded transition fitting
• Fire Suppression Systems — Transitions 1" socket tee branch outlets and cross ports directly to 3/4" male-threaded sprinkler supply connections, control valve inlets, and branch assembly ports in light-hazard Schedule 40 PVC fire suppression systems where the socket-to-threaded component transition must occur directly at the 1" socket fitting hub
• Industrial Process Piping — Transitions 1" socket fitting hub branch outlets and manifold ports to 3/4" male-threaded pump inlets, valve bodies, flow meters, 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" socket assembly ports in the most compact single-fitting transition
• Water Treatment & Aquaculture — Used at 1" socket tee branches, cross ports, and manifold hub outlets where 3/4" male-threaded zone valves, filter 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" socket fitting hub ports to 3/4" male-threaded pump connections, 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