Bushing, Spigot x FPT (Flush Style) PVC Schedule 80 1-1/4" x 1" (838-168)

This 1-1/4" × 1" Schedule 80 PVC Flush Bushing provides the shallowest available slip-to-thread size transition in the 838-series 1-1/4" inlet sub-run — a one-step reduction from a 1-1/4" slip socket port to a 1" 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 1" FPT end receives any compatible 1" male-threaded valve, nipple, pump body, strainer, flow meter, check valve, or equipment connection on the reduced threaded side.

The one-step reduction from 1-1/4" to 1" is the minimal adjacent-size transition in the 1-1/4" inlet sub-run, and the 1" FPT outlet gives the 838-168 the broadest downstream application reach of the three 838-series bushings at this inlet size. One-inch NPT is among the most prevalent connection sizes across the full range of commercial and industrial piping equipment — standard ball valves, gate valves, check valves, strainer bodies, pump discharge and suction ports, flow meters, pressure gauges, and equipment nozzles are routinely manufactured at 1" NPT. Wherever a 1-1/4" slip socket position in a solvent-welded Schedule 80 system must interface with any of these 1"-ported components, the 838-168 bridges the slip-to-thread transition and size reduction in a single fitting at the socket face — the most direct possible connection between the 1-1/4" cemented system and the 1"-ported downstream component.

Within the 838-series 1-1/4" inlet sub-run, the three available entries serve three distinct downstream connection requirements. The 838-166 makes a three-step reduction to 1/2" NPT for chemical dosing equipment, instrument supply valves, and small-bore components. The 838-167 makes a two-step reduction to 3/4" NPT for the broader population of 3/4"-ported valves, strainers, and equipment. The 838-168 makes the one-step adjacent-size reduction to 1" NPT — the most common downstream valve and equipment connection size in standard commercial and industrial piping. When the downstream component presents a 1" male-threaded inlet at a 1-1/4" socket position, the 838-168 is the correct and most direct selection.

Selecting between the 838-168 and its all-threaded counterpart the 839-168 (1-1/4" × 1" MPT × FPT, previously written) requires identifying the upstream connection type at the 1-1/4" port. Both fittings produce an identical 1" FPT outlet serving the same downstream 1"-ported components — the sole distinction is upstream. The 838-168 spigot end cements into a 1-1/4" female slip socket; the 839-168 MPT end threads into a 1-1/4" female-threaded port. When the 1-1/4" port to be reduced presents a slip socket opening — on a tee, coupling, cross, or other slip-socket fitting — the 838-168 is correct. When the port presents female threads, the 839-168 applies. Stocking both ensures complete coverage of the 1-1/4" × 1" size transition regardless of the upstream port type encountered in the system.

The one-step geometry of the 838-168 produces the smoothest hydraulic transition of the three 838-series 1-1/4"-inlet bushings. The minimal size differential between the 1-1/4" spigot inlet and the 1" FPT outlet minimizes the flow velocity change at the bushing body — a consideration in flow-metering runs, pump suction approach piping, and other flow-sensitive applications where pressure drop minimization and smooth velocity transitions at size reductions are design requirements alongside the slip-to-thread transition function.

As with all 838-series fittings, the spigot end is the defining feature distinguishing this bushing from the 839-series. The spigot end — a male plain end matching 1-1/4" PVC pipe OD — cements permanently into the receiving slip socket, becoming a monolithic part of the solvent-welded upstream system. This allows a 1" threaded outlet to be introduced directly at any 1-1/4" slip socket position without modifying the upstream piping or adding intermediate adapter fittings between the socket and the threaded transition.

The flush style eliminates the protruding hex shoulder of a standard hex bushing, producing a low-profile, streamlined assembly that installs cleanly inside the receiving 1-1/4" slip socket. The close sizing between the 1-1/4" spigot and the 1" outlet means the bushing body is physically compact relative to deeper-reducing variants — maintaining a minimal profile at the transition point and preserving clearance in congested piping assemblies where adjacent fittings limit the available space at each socket position.

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 1" FPT end before installing downstream components. Hand-tighten plus one to two turns — 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 1" threaded outlet at a 1-1/4" slip socket position on process headers, pump suction manifolds, secondary distribution tees, and equipment supply connections in chemical processing, water treatment, and manufacturing facility piping where downstream 1" NPT ball valves, gate valves, check valves, strainer bodies, and equipment nozzles must interface with 1-1/4" socket positions in the solvent-welded system — the defining application given the near-universal prevalence of 1" NPT ports on standard commercial and industrial downstream equipment at 1-1/4" secondary header socket positions
• Pump & Equipment Connections — Bridges a 1-1/4" slip socket position to a 1" NPT pump inlet, discharge fitting, strainer body, or equipment nozzle in process and mechanical systems where the solvent-welded 1-1/4" PVC system must interface with the broad range of 1"-ported equipment in a single fitting at the socket face — the most efficient connection available at this size combination given the smooth one-step transition and the elimination of intermediate adapter assemblies
• Commercial Plumbing — Reduces a 1-1/4" slip socket port on a tee, coupling, or manifold to a 1" threaded outlet at shutoff valve connections, pressure gauges, backflow preventer inlets, and equipment connection stubs in mechanical room and building water distribution Schedule 80 systems where secondary headers in 1-1/4" cemented pipe must interface with 1" NPT-ported downstream plumbing components
• Water & Wastewater Treatment — Delivers a one-step spigot-to-thread size transition at 1-1/4" socket positions on process headers, secondary distribution assemblies, pump suction branch connections, and filter vessel outlet branch piping in municipal and industrial water treatment facilities where 1" NPT downstream valves, meters, and process equipment must interface with 1-1/4" slip socket positions in the solvent-welded system layout
• Chemical Handling — Provides a corrosion-resistant one-step slip-to-thread transition at 1-1/4" socket positions on chemical feed headers, reagent distribution secondary branches, and tank recirculation loop supply connections in systems handling acids, caustics, and aggressive process fluids where 1" NPT-ported downstream valves and equipment must be introduced at 1-1/4" socket positions in the fully solvent-welded chemical handling system
• Irrigation & Agricultural Systems — Reduces a 1-1/4" socket position on a tee, coupling, or cross to a 1" threaded outlet at control valve connections, filter housing ports, fertigation injector inlets, and pump connection ports in solvent-welded Schedule 80 commercial irrigation, greenhouse, and agricultural water supply systems where 1" NPT downstream components interface with 1-1/4" slip socket secondary header positions
• 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 1" NPT-ported valves, strainers, and mechanical system components must interface with 1-1/4" slip socket positions in the solvent-welded mechanical system piping layout