Bushing, Spigot x FPT (Flush Style) PVC Schedule 80 3/4" x 1/4" (838-098)

This 3/4" x 1/4" Schedule 80 PVC Bushing (Spigot x FPT) provides a compact mixed-connection transition from a 3/4" socket fitting hub down to a 1/4" female NPT-threaded instrument port outlet, consolidating a 3:1 diameter reduction and a socket-to-thread material transition into a single fitting body — serving the specialized application of incorporating a pressure monitoring tap, gauge connection, sampling port, or small-bore chemical injection stub directly at a 3/4" Schedule 80 socket fitting hub without an intermediate adapter chain or multi-piece transition assembly. Constructed in dark gray Schedule 80 PVC with a flush profile, it delivers the elevated pressure rating and enhanced chemical resistance of Schedule 80 construction at both the socket spigot inlet and the 1/4" female-threaded instrument port outlet.

The 3/4" spigot (male plain end) is sized to insert directly into the hub of any standard 3/4" 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 1/4" FPT interior accepts any standard 1/4" male NPT-threaded instrument fitting, pressure gauge connection, sampling valve, chemical injection nipple, or sensor port for a pressure-tight mechanical connection when made up with thread sealant or PTFE tape. The 1/4" FPT outlet is the industry-standard connection size for pressure gauges, pressure transducers, temperature sensors, sampling valves, and small-bore chemical injection ports throughout commercial and industrial PVC piping systems — making this bushing the correct single-fitting solution wherever a 3/4" Schedule 80 socket assembly must incorporate an instrument or monitoring tap without the overhead of a separate tee, nipple, hex bushing, and adapter chain at the same port location. At the 3/4" spigot inlet, this fitting is more broadly applicable than the 838-052 (3/8" x 1/4") documented in this catalog session — the 3/4" socket hub is one of the most widely specified fitting port sizes in both residential and commercial Schedule 80 assemblies, making this the more commonly encountered instrument port bushing of the two confirmed small-bore 838 series entries. This Spigot x FPT configuration should not be confused with any 837 series all-slip counterpart at this size (Spigot x Slip, 3/4" x 1/4" if stocked), which would provide a 1/4" socket outlet for a cemented pipe run rather than a threaded instrument connection, or with the 839 series MPT x FPT flush bushing, which installs entirely within a threaded assembly without a socket hub inlet.

Rated to approximately 630 psi at 73°F (governed by the 3/4" spigot end), this bushing delivers the elevated pressure performance of Schedule 80 construction — nearly double the pressure rating of the Schedule 40 equivalent — making it well-suited for demanding chemical process, high-pressure irrigation, and industrial fluid handling applications where instrument taps must be incorporated at 3/4" Schedule 80 socket fitting hubs. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to the spigot exterior and the interior of the receiving 3/4" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. On the 1/4" FPT end, use PTFE tape — wrapping a minimum of two to three times in the thread direction — and confirm that the 1/4" male NPT threads of the mating instrument or service component are started by hand and seated squarely before applying final torque; at 1/4", 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 1/4" the engagement range before overtorque risk is particularly 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 1/4" male-threaded pressure gauge taps, pressure transducer connections, temperature sensor ports, sampling valve stubs, and small-bore chemical injection fittings directly at 3/4" Schedule 80 socket fitting hubs on process water distribution headers, chemical feed lines, and industrial fluid handling assemblies where instrument monitoring taps must be integrated into high-pressure socket assemblies at the most commonly specified lateral distribution hub size in Schedule 80 systems
• Chemical Process Piping — Provides a corrosion-resistant mixed-connection socket-to-instrument-port transition at 3/4" Schedule 80 socket hub ports in systems conveying acids, caustics, fertilizer solutions, and other chemically aggressive fluids where 1/4" male-threaded pressure monitoring instruments, sampling valves, chemical injection stubs, and sensor connections must be tapped directly off high-pressure 3/4" socket assembly hubs without metal adapter chains
• Irrigation & Water Distribution — Provides 1/4" male-threaded pressure monitoring taps, pressure gauge connections, and small-bore instrument stubs directly at 3/4" Schedule 80 socket tee branches, cross ports, and manifold hubs in agricultural and municipal irrigation pump stations and high-pressure distribution assemblies where elevated pressure ratings are required at instrument monitoring tap points throughout the 3/4" Schedule 80 assembly
• Water Treatment & Aquaculture — Used at 3/4" Schedule 80 socket tee branches, cross ports, and manifold hub outlets where 1/4" male-threaded pressure monitoring instruments, chemical dosing ports, sampling valves, and treatment equipment sensor connections must be incorporated directly at socket fitting hubs with NSF/ANSI 61 compliance and Schedule 80 pressure performance required throughout
• Commercial Plumbing — Provides a 1/4" male-threaded pressure gauge tap, test point connection, or instrument stub directly at 3/4" Schedule 80 socket fitting hub ports in commercial building water distribution systems where system pressure monitoring or test point access must be incorporated at high-pressure socket fitting locations without a separate threaded adapter assembly at the port
• HVAC & Mechanical Systems — Incorporates 1/4" male-threaded pressure sensor connections, gauge taps, and instrument ports directly at 3/4" Schedule 80 socket fitting hubs on cooling tower supply headers, chilled water distribution assemblies, and chemically treated water system socket fitting manifolds within the Schedule 80 pressure class where instrument monitoring tap points must be built into high-pressure 3/4" socket assemblies