Reducer Bushing, Spigot x FPT PVC Schedule 40 3" x 2-1/2" (438-339)

This 3" x 2-1/2" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact, inline solution for transitioning a 3" socket-end fitting hub down to a 2-1/2" 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 2-1/2" male NPT-threaded valve, pump port, equipment connection, or threaded pipe run 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 2-1/2" FPT interior accepts any standard 2-1/2" male NPT-threaded fitting, nipple, valve, or equipment connection, providing a direct large-diameter socket-to-thread transition in a single compact body. The 3" to 2-1/2" step-down is the most modest reduction in the 3" spigot inlet series — a one-half-step nominal reduction that preserves near-full mainline flow capacity through the transition and is primarily driven by the need to interface a 3" socket assembly with a 2-1/2" threaded component rather than by any significant hydraulic sizing requirement. This configuration is most commonly encountered where equipment, valves, or threaded pipe runs are specified at 2-1/2" while the upstream socket-based PVC system is built to 3" — allowing a direct, low-restriction socket-to-thread interface without an intermediate full-size coupling and separate threaded adapter.

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 2-1/2" FPT end, use a quality pipe thread sealant or PTFE tape on all male NPT threads before engagement. At 2-1/2", ensure even thread engagement around the full circumference before final make-up — uneven engagement at large diameters can result in cross-threading or incomplete seating. 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 2-1/2" male-threaded control valves, pump inlets, filter housings, and zone headers in large-diameter agricultural and municipal irrigation systems where equipment or valves are specified at 2-1/2" while the upstream socket PVC system is built to 3"
• Industrial Process Piping — Interfaces 3" socket PVC assemblies with 2-1/2" male-threaded pump inlets, valve bodies, flow meters, and equipment ports in water treatment, chemical processing, and manufacturing facilities where a near-full-size socket-to-thread transition is required at large-diameter system interfaces
• Commercial Plumbing — Connects 3" socket-end distribution assemblies to 2-1/2" male-threaded valves, pressure-reducing stations, and riser connections in commercial building water supply systems where upstream socket PVC and downstream threaded components must be joined at a minimal step-down transition point
• Chemical Handling — Provides a corrosion-resistant, mixed-connection large-diameter transition in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, particularly at pump inlets, valve stations, and equipment interfaces where 3" socket PVC pipe must transition directly to 2-1/2" male-threaded components
• Water Treatment & Aquaculture — Used at filter housing inlets, pump suction connections, treatment equipment interfaces, and recirculating system manifold ports where a 3" socket assembly must transition to a 2-1/2" male-threaded component with minimal flow restriction and NSF/ANSI 61 compliance is required
• HVAC & Mechanical Systems — Connects 3" socket-end PVC assemblies to 2-1/2" male-threaded pump ports, valve bodies, and equipment connections on cooling tower supply headers, chilled water distribution mains, and chemically treated water systems within the Schedule 40 pressure rating class