Bushing, Spigot x FPT (Flush Style) PVC Schedule 80 1-1/4" x 3/4" (838-167)

This 1-1/4" × 3/4" Schedule 80 PVC Flush Bushing provides a one-step solvent-cement-to-thread size transition, reducing a 1-1/4" slip socket port down to a 3/4" female NPT threaded outlet in a single compact fitting. The 1-1/4" spigot end inserts directly into any standard 1-1/4" female slip socket fitting or coupling for solvent cement joining on the upstream side, while the 3/4" FPT end receives any compatible 3/4" male-threaded valve, nipple, strainer, flow meter, pump port, or equipment connection on the reduced threaded side.

The mixed spigot-and-thread construction is the defining operational characteristic of the 838-167 — and the selection criterion that distinguishes it from its all-threaded counterpart at the same size. At 1-1/4" × 3/4", two Schedule 80 flush bushing series are available: the 839-167 (MPT × FPT), which threads into a female-threaded 1-1/4" port upstream, and the 838-167, which cements into a slip socket 1-1/4" port upstream. Both produce the same 3/4" FPT outlet for the same range of downstream threaded components — the selection between them depends entirely on the upstream connection type. When the 1-1/4" port to be reduced is a slip socket (on a tee, coupling, cross, or slip-socket fitting), the 838-167 is the correct selection. When the 1-1/4" port presents female threads, the 839-167 applies. Stocking both ensures complete coverage of the 1-1/4" × 3/4" size transition regardless of the upstream connection type encountered in the system.

This size transition — from a 1-1/4" socket position to a 3/4" threaded outlet — addresses one of the most common interface requirements in secondary-header and equipment-connection piping. The 1-1/4" pipe size serves secondary distribution headers, pump suction lines, equipment feed connections, and branch mains where 1" is undersized and 1-1/2" exceeds the flow requirement. At these 1-1/4" socket positions in a solvent-welded system, the downstream component frequently presents a 3/4" male-threaded connection — a ball valve, strainer body, pump port, or flow meter — requiring a transition from the cemented system into the threaded component without an intermediate adapter. The 838-167 accomplishes this slip-to-thread transition and size reduction in a single fitting at the socket face, eliminating the need for a full-size 1-1/4" socket female adapter followed by a separate 1-1/4"-to-3/4" reducing bushing.

As with all 838-series fittings, the spigot end is the critical feature distinguishing this bushing from its 839-series counterpart. The spigot end — a male plain end whose OD matches 1-1/4" PVC pipe — inserts into and cements within any 1-1/4" female slip socket, becoming a permanent, chemically fused part of the solvent-welded system on the upstream side. This allows a 3/4" threaded outlet to be introduced directly at any 1-1/4" slip socket position in the cemented piping without modifying the upstream system layout or adding intermediate adapter fittings.

The flush style eliminates the protruding hex shoulder found on standard hex bushings, producing a low-profile, streamlined assembly that sits cleanly inside the receiving 1-1/4" slip socket without adding axial bulk to the connection. In compact mechanical assemblies, manifold bodies, and equipment supply connections where a hex shoulder would create interference with adjacent pipe runs or restrict wrench access to nearby fittings, the flush profile maintains clearance and keeps the fitting footprint tight to the socket face.

Manufactured in dark gray Schedule 80 PVC, this bushing delivers the increased wall thickness and mechanical strength required in industrial, chemical, and commercial pressure piping where Schedule 40 ratings are insufficient. PVC's broad chemical resistance covers acids, bases, salts, chlorine, and most common process fluids, providing long service life in corrosive environments where metal bushings would degrade, seize on threads, or introduce contamination into the fluid stream. NSF/ANSI 61 listing confirms suitability for potable water contact.

Rated to 630 psi at 73°F (governed by the 1-1/4" spigot end), this fitting handles standard to elevated pressure service across a wide range of fluid handling applications. For the spigot end, clean and dry the spigot exterior and receiving socket interior before application. Apply purple PVC primer to both mating surfaces, then apply a uniform coat of Schedule 80 PVC solvent cement to both surfaces before inserting. Hold firmly with a slight quarter-turn twist for 30 seconds and allow full cure time per the cement manufacturer's temperature and humidity guidelines before pressurizing. Apply PTFE tape or compatible thread sealant to all male threads engaging the 3/4" FPT end before installing downstream components. Hand-tighten plus one to two turns with a strap wrench — do not over-torque PVC female threads. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Industrial Process Piping — Introduces a 3/4" threaded outlet at a 1-1/4" slip socket position on process headers, pump suction manifolds, equipment supply connections, and secondary distribution fittings in chemical processing, water treatment, and manufacturing facility piping — the defining application where the 1-1/4" slip-socket piping layout must interface with 3/4" NPT-ported downstream valves, strainers, meters, or equipment ports without adding a separate full-size socket adapter and downstream reducing bushing at the transition point
• Commercial Plumbing — Reduces a 1-1/4" slip socket port on a tee, coupling, or manifold to a 3/4" threaded outlet at valve connections, pressure gauge assemblies, shutoff valve bodies, and backflow preventer ports in mechanical room and building water distribution Schedule 80 systems where the secondary header or branch piping runs in 1-1/4" solvent-welded PVC and downstream components present 3/4" MPT inlets
• Pump Suction & Equipment Supply Connections — Provides a compact slip-to-thread size transition at 1-1/4" socket positions on pump suction assemblies, equipment feed connections, and secondary distribution headers where the solvent-welded PVC system must interface with 3/4" NPT-ported pump inlet flanges, strainer bodies, and equipment nozzles in a single fitting at the socket face
• Water & Wastewater Treatment — Delivers a spigot-to-thread size reduction at 1-1/4" socket positions on process headers, chemical dosing distribution assemblies, filter vessel branch connections, and instrument supply taps in municipal and industrial water treatment facilities where the solvent-welded system transitions to 3/4" NPT-ported downstream valves and instruments
• Chemical Handling — Provides a corrosion-resistant spigot-to-thread transition at 1-1/4" socket positions on chemical feed headers, reagent distribution assemblies, and tank recirculation secondary branches in systems handling acids, caustics, and aggressive process fluids where the solvent-welded PVC system must connect to 3/4" MPT-ported downstream chemical handling equipment
• Irrigation & Agricultural Systems — Reduces a 1-1/4" socket position on a tee or coupling to a 3/4" threaded outlet at control valve connections, filter housing ports, fertigation injector inlets, and pressure regulator bodies in solvent-welded Schedule 80 commercial irrigation, greenhouse, and agricultural water supply systems where the 1-1/4" secondary header feeds 3/4" NPT-ported zone control and chemical injection components
• HVAC & Mechanical Systems — Installed at 1-1/4" socket positions on Schedule 80 PVC cooling tower makeup lines, treated water secondary distribution assemblies, and glycol system branch connections where the solvent-welded pipe system must transition to 3/4" NPT-ported valves, meters, and mechanical system components at equipment connection points