Bushing, Spigot x FPT PVC Schedule 40 3" x 3/4" (438-334)

This 3" x 3/4" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact, inline solution for transitioning a 3" socket-end fitting hub down to a 3/4" female-threaded connection in commercial and light industrial PVC piping systems. Constructed in white Schedule 40 PVC, it delivers the corrosion resistance and chemical compatibility required across a wide range of fluid handling applications where a large-diameter socket assembly must interface with a 3/4" male NPT-threaded valve, pump port, equipment connection, or threaded service line without additional transition hardware.

The 3" spigot (male plain end) is sized to insert directly into the hub of any standard 3" socket-end fitting — tee, cross, coupling, elbow, or valve body — and is solvent-cemented in place to form a permanent, leak-free joint at the outer face. The 3/4" FPT interior accepts any standard 3/4" male NPT-threaded fitting, nipple, valve, or equipment connection, providing a direct large-diameter socket-to-thread transition in a single compact body. This Spigot x FPT configuration bridges the all-socket PVC world and the threaded component world at this size combination — making it the correct choice when a 3" socket assembly must feed into or terminate at a 3/4" threaded valve, solenoid, instrument port, or small-bore service connection without requiring an intermediate all-socket reducer and separate threaded adapter. The 3" to 3/4" step-down is a significant 4:1 reduction most commonly encountered at large-diameter tee or cross branch outlets serving 3/4" dedicated service lines, solenoid valve inlets, instrument taps, chemical injection points, and small-bore distribution branches where a threaded outlet is required at the transition point rather than a solvent-cement socket.

Rated to 260 psi at 73°F (governed by the 3" spigot end), this bushing is suited for standard commercial and light industrial water distribution and irrigation service within its pressure class. Its PVC composition provides excellent resistance to corrosion, scale, chlorinated water, and a broad range of chemical exposures, making it a reliable long-term alternative to metal reducing bushings in moisture-prone or chemically active environments. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to the spigot exterior and the interior of the receiving 3" 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 all male NPT threads before engagement. Avoid over-torquing — PVC threads require hand-tight plus one to two turns; excessive force can crack the fitting. 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 — Transitions 3" socket-end mainline tees, crosses, and manifold assemblies to 3/4" male-threaded solenoid valves, drip emitter manifolds, filter housings, and zone control valves in large-diameter agricultural and municipal irrigation systems where small-diameter threaded components are tapped directly off a 3" socket mainline assembly
• Industrial Process Piping — Interfaces 3" socket PVC assemblies with 3/4" male-threaded instrument taps, chemical injection ports, sample valves, drain connections, and small-bore service lines in water treatment, chemical processing, and manufacturing facilities where a significant socket-to-thread size reduction is required at a branch or termination point
• Commercial Plumbing — Connects 3" socket-end distribution assemblies to 3/4" male-threaded branch valves, pressure gauge taps, fixture supply connections, and service line inlets in commercial building water supply systems where 3" socket mains must interface with standard 3/4" threaded service components
• Chemical Handling — Provides a corrosion-resistant, mixed-connection large-to-small reduction in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, particularly at chemical injection points, metering pump inlets, and solenoid valve connections where 3" socket PVC pipe must transition to a 3/4" threaded interface
• Water Treatment & Aquaculture — Used at filter housing branch taps, chemical dosing ports, recirculating system instrument connections, and treatment equipment interfaces where a 3" socket assembly must transition to a 3/4" male-threaded component and NSF/ANSI 61 compliance is required throughout the system
• HVAC & Mechanical Systems — Connects 3" socket-end PVC assemblies to 3/4" male-threaded sensor ports, drain valves, chemical feed connections, and small-diameter service branches on cooling tower supply headers, chilled water distribution mains, and chemically treated water systems within the Schedule 40 pressure rating class