Reducer Bushing, Spigot x FPT PVC Schedule 40 1/2" x 3/8" (438-073)

This 1/2" x 3/8" Schedule 40 PVC Reducer Bushing (Spigot x FPT) provides a compact mixed-connection transition from a 1/2" socket fitting hub down to a 3/8" female NPT-threaded outlet, consolidating a modest 1.33:1 diameter reduction and a socket-to-thread material transition into a single fitting body without the need for a separate reducer coupling, hex bushing, or multi-piece transition assembly. Constructed in white Schedule 40 PVC, it offers reliable performance in commercial plumbing, irrigation, and light industrial installations where a 3/8" male-threaded instrument fitting, pressure gauge connection, flow meter port, sensor component, or legacy small-bore service connection must be installed directly at a 1/2" socket assembly port location.

The 1/2" spigot (male plain end) is sized to insert directly into the hub of any standard 1/2" 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 3/8" FPT interior accepts any standard 3/8" male NPT-threaded fitting, instrument connection, pressure gauge, flow meter port, sensor fitting, or legacy service component for a pressure-tight mechanical connection when made up with thread sealant or PTFE tape. The 3/8" FPT outlet is a less commonly specified NPT thread size than the industry-standard 1/4" instrument port or the widely specified 1/2" service connection — appearing in specific legacy instrument fittings, certain pressure gauges and flow meters with 3/8" NPT connections, and dedicated small-bore service components where the 3/8" thread size is specified by the downstream equipment or instrument manufacturer. This Spigot x FPT mixed-connection configuration is the correct choice when the upstream 1/2" assembly is an all-socket PVC system and the downstream component presents a 3/8" male NPT thread requiring a female port at the hub location — directly paralleling the function of 438-129 (1" x 3/8" Spigot x FPT, confirmed in this catalog session) at the smaller 1/2" socket hub inlet size. It should not be confused with any 437 series all-slip counterpart at this size (Spigot x Slip, 1/2" x 3/8" if stocked), which would provide a 3/8" socket outlet for a cemented pipe run rather than a threaded component, or with the 438-098 (3/4" x 1/4" Spigot x FPT, confirmed in this session), which serves the standard 1/4" instrument port application at a larger socket hub inlet.

Rated to approximately 600 psi at 73°F (governed by the 1/2" spigot end), this bushing carries the highest pressure rating of any confirmed 438 series entry — reflecting the elevated pressure capacity of small-bore Schedule 40 PVC socket fittings at the 1/2" nominal size. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to the spigot exterior and the interior of the receiving 1/2" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. On the 3/8" FPT end, use PTFE tape — wrapping a minimum of two to three times in the thread direction — and confirm that the 3/8" male NPT threads of the mating component are started by hand and seated squarely before applying final torque; at 3/8", the shallow thread engagement depth makes cross-threading a more common installation error than at larger diameters. Avoid over-torquing — PVC threads require hand-tight plus one to two turns; at 3/8", the engagement range before overtorque risk is short. 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:

• Industrial Process Piping — Incorporates 3/8" male-threaded pressure gauge connections, flow meter ports, pressure transducer inlets, and legacy instrument fittings directly at 1/2" socket fitting hubs on small-bore process water distribution headers, chemical feed lines, and industrial fluid handling assemblies in water treatment, chemical processing, and manufacturing facilities where a downstream instrument or service component specifies a 3/8" NPT male connection at a 1/2" socket hub port location
• Irrigation & Water Distribution — Provides 3/8" male-threaded pressure monitoring connections, flow meter stubs, and small-bore instrument taps directly at 1/2" socket tee branches, cross ports, and manifold hubs in agricultural and residential irrigation assemblies where a 3/8" NPT-specified instrument or monitoring component must interface with a 1/2" all-socket distribution assembly port
• Chemical Process Piping — Delivers a corrosion-resistant mixed-connection socket-to-thread transition at 1/2" socket fitting hub ports in systems conveying acids, caustics, fertilizer solutions, and other chemically aggressive fluids where a 3/8" male-threaded instrument connection, legacy chemical injection stub, or small-bore service component must be incorporated at the socket fitting hub without metal adapter chains
• Commercial Plumbing — Provides a 3/8" male-threaded instrument stub, pressure gauge connection, or legacy service fitting access point directly at 1/2" socket fitting hub outlets in commercial building water distribution systems where a downstream component or equipment inlet specifies a 3/8" NPT male thread at a 1/2" socket assembly port
• Water Treatment & Aquaculture — Used at 1/2" socket tee branches, cross ports, and manifold hub outlets where 3/8" male-threaded instrument connections, flow meter ports, pressure monitoring components, and legacy service fittings must be incorporated directly at socket fitting hub locations with NSF/ANSI 61 compliance required throughout the assembly
• Laboratory & Analytical Systems — Provides a 3/8" female-threaded instrument or service port at inline locations along 1/2" socket PVC fluid distribution runs in laboratory, analytical, and pilot plant systems where specific instrument connections, sampling valves, and flow measurement devices specify a 3/8" NPT male connection at 1/2" socket hub fitting locations