Bushing, Spigot x FPT (Flush Style) PVC Schedule 80 1" x 1/4" (838-128)

This 1" x 1/4" Schedule 80 PVC Flush Bushing (Spigot x FPT) provides a compact, low-profile solution for adding a 1/4" female-threaded instrument port, gauge tap, or small-bore service connection to any standard 1" socket-end fitting hub in industrial, chemical, and commercial Schedule 80 PVC piping systems. Constructed in dark gray Schedule 80 PVC, it delivers the elevated wall thickness and pressure capacity required in demanding installations where a corrosion-resistant, mixed-connection large-to-small transition is needed at an existing socket fitting port without the added bulk of a hex shoulder fitting.

The 1" spigot (male plain end) is sized to insert directly into the hub of any standard 1" 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 flush style design eliminates the protruding hex shoulder found on standard hex bushings, creating a streamlined, low-profile transition that installs cleanly inside the receiving socket fitting without adding unnecessary bulk to the assembly. The 1/4" FPT interior accepts any standard 1/4" male NPT-threaded fitting, instrument connection, pressure gauge, sampling valve, or test port fitting for a pressure-tight mechanical connection when made up with thread sealant or PTFE tape. At the 1" x 1/4" combination, this bushing is most commonly encountered adding a standard instrument tap or gauge connection to a 1" Schedule 80 socket assembly — a 4:1 reduction that bridges the gap between the 1" mainline socket world and the 1/4" NPT standard used for pressure gauges, thermowells, sample valves, and instrument transmitter connections throughout industrial and chemical process piping systems.

Rated to approximately 630 psi at 73°F (governed by the 1" spigot end), this bushing is well-suited for demanding pressure service across a broad range of industrial, chemical, and commercial fluid handling applications. Its PVC composition provides excellent resistance to acids, bases, salts, and chlorinated water, making it a durable long-term choice in corrosive environments where metal fittings would degrade or contaminate the system fluid. NSF/ANSI 61 listing confirms suitability for potable water contact, including use in drinking water distribution and treatment systems.

Apply solvent cement to the spigot exterior and the interior of the receiving 1" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. On the 1/4" FPT end, use a quality pipe thread sealant or PTFE tape on the male NPT threads of the mating instrument or gauge connection before engagement. At 1/4", the small thread engagement depth requires particular care to avoid cross-threading — start threads by hand and confirm square engagement before applying torque. Avoid over-torquing — PVC threads require hand-tight plus one to two turns; excessive force can crack the fitting body or damage the receiving threads at this small diameter. 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 — Adds a standard 1/4" NPT instrument tap, pressure gauge connection, thermowell port, or sample valve outlet to 1" Schedule 80 socket tees, crosses, and fitting assemblies in chemical processing, water treatment, and manufacturing facilities where 1/4" NPT is the standard instrument connection size regardless of mainline pipe diameter
• Chemical Handling — Provides a corrosion-resistant, low-profile socket-to-instrument-port transition on 1" Schedule 80 chemical distribution manifolds, injection line assemblies, and process piping headers conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, where a 1/4" instrument tap must be added at a socket fitting hub without introducing a hex shoulder fitting into the assembly
• Water Treatment & Aquaculture — Used to add 1/4" pressure monitoring ports, chemical dosing sample taps, and instrument connections to 1" Schedule 80 socket assemblies in recirculating systems, treatment equipment manifolds, and chemical feed distribution headers where NSF/ANSI 61 compliance and Schedule 80 pressure capacity are required at instrument connection points
• Commercial Plumbing — Provides a low-profile 1/4" threaded instrument or gauge tap at 1" Schedule 80 socket fitting hubs in high-pressure or exposed commercial building water supply systems where a compact, flush-style bushing is preferred over a hex shoulder fitting at monitoring and test connection points
• Irrigation & Water Distribution — Adds 1/4" male-threaded pressure gauge connections, chemical injection ports, and instrument taps to 1" Schedule 80 socket assemblies at pump station monitoring points, filter housing pressure tap locations, and valve station instrument connections in high-pressure agricultural and municipal irrigation systems
• HVAC & Mechanical Systems — Provides a 1/4" instrument tap, pressure gauge port, or chemical feed connection at 1" Schedule 80 socket fitting hubs on cooling tower chemical distribution manifolds, chilled water monitoring assemblies, and chemically treated water systems requiring elevated pressure ratings at instrument connection points