Reducer Bushing, Spigot x FPT PVC Schedule 40 3" x 1-1/2" (438-337)

This 3" x 1-1/2" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact, inline solution for transitioning a 3" socket-end fitting hub down to a 1-1/2" 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 1-1/2" 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 1-1/2" FPT interior accepts any standard 1-1/2" male NPT-threaded fitting, nipple, valve, or equipment connection, providing a direct large-diameter socket-to-thread transition in a single compact body. 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 terminate at or feed into a 1-1/2" threaded valve, pump inlet, filter housing, or equipment port without requiring an intermediate all-socket reducer and separate threaded adapter. The 3" to 1-1/2" step-down is a clean 2:1 reduction to one of the most widely specified branch and equipment connection sizes across commercial plumbing, irrigation, and light industrial systems — making this among the most commonly encountered entries in the 3" spigot inlet sub-series and a practical fitting at pump station inlets, valve station assemblies, filter housing connections, and branch supply interfaces where 1-1/2" threaded components are routinely paired with a 3" socket mainline.

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 1-1/2" 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 1-1/2" male-threaded control valves, filter housings, pump inlets, and zone headers in large-diameter agricultural and municipal irrigation systems where 1-1/2" threaded components are among the most commonly paired equipment connections at 3" socket mainline assemblies
• Industrial Process Piping — Interfaces 3" socket PVC assemblies with 1-1/2" male-threaded pump inlets, valve bodies, flow meters, and equipment ports in water treatment, chemical processing, and manufacturing facilities where a clean 2:1 socket-to-thread transition connects a large-diameter distribution main to a widely used intermediate-size threaded equipment connection
• Commercial Plumbing — Connects 3" socket-end distribution assemblies to 1-1/2" male-threaded valves, branch supply risers, and equipment feed connections in commercial building water supply systems where 3" mains must interface with 1-1/2" threaded service components at branch or termination points
• Chemical Handling — Provides a corrosion-resistant, mixed-connection mid-range reduction in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, at pump inlets, valve stations, and chemical feed equipment interfaces where 3" socket PVC pipe must transition to 1-1/2" 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 1-1/2" male-threaded component and NSF/ANSI 61 compliance is required throughout the system
• HVAC & Mechanical Systems — Connects 3" socket-end PVC assemblies to 1-1/2" 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