Bushing, MPT x FPT (Flush Style) PVC Schedule 80 1-1/4" x 1" (839-168)

This 1-1/4" × 1" Schedule 80 PVC Flush Bushing provides a compact, all-threaded one-step size reduction from a 1-1/4" female-threaded port down to a 1" male-threaded connection. The 1-1/4" MPT exterior threads directly into any compatible 1-1/4" FPT port — on a tee branch, cross outlet, valve body, manifold fitting, or equipment nozzle — while the 1" FPT interior receives any compatible 1" male-threaded fitting, nipple, valve, strainer, pump body, or equipment connection on the reduced side.

The single pipe-size step from 1-1/4" to 1" is the shallowest reduction available in the 839-series 1-1/4" inlet sub-run, and the 1" FPT outlet is what makes this bushing a particularly high-frequency component in Schedule 80 threaded systems. One-inch NPT is one of 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 with 1" NPT inlets and outlets. Wherever a 1-1/4" FPT port must interface with any of these 1"-ported components, the 839-168 provides the most direct possible bridge — a single fitting that reduces the port and presents the 1" FPT outlet without intermediate adapters or additional fittings in the assembly.

Within the 1-1/4" inlet sub-run, this bushing occupies a distinct application niche from its sibling 839-167 (1-1/4" × 3/4"). Where the 839-167 makes a two-step reduction to reach 3/4" NPT — a size common at gauges, instrument taps, and smaller valves — the 839-168 makes a single-step reduction to 1" NPT, serving the broader population of valves, pumps, and process equipment that are standardized at 1" threaded connections. The two fittings are complementary rather than redundant: the correct choice depends entirely on the NPT port size of the downstream component.

As with all 839-series fittings, the all-threaded MPT × FPT configuration is the defining characteristic that distinguishes this bushing from the 838-series. Where the 838 spigot end cements into a slip socket, the 839 MPT end threads into a female-threaded port — making the 839-168 the correct selection wherever the receiving fitting presents a 1-1/4" FPT opening. No solvent cement, primer, or curing time is required at the bushing installation point; the entire assembly is made up with PTFE tape and thread sealant in a fully threaded connection.

The flush style eliminates the protruding hex shoulder found on standard hex bushings, producing a low-profile, streamlined assembly that installs cleanly inside the receiving FPT port without adding axial bulk to the connection. In threaded manifold assemblies, valve body ports, and closely spaced equipment connections, the absence of a hex shoulder preserves clearance and keeps the fitting profile tight to the port face — particularly valuable where adjacent fittings or structural members limit the space available at each port 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 corrode, 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" MPT end), this bushing handles standard to elevated pressure service across a wide range of fluid handling applications. Apply PTFE tape or compatible thread sealant to the 1-1/4" MPT exterior before threading into the receiving FPT port. Hand-tighten plus one to two turns — do not over-torque PVC threads, as excessive force risks cracking the receiving fitting or the bushing body at the thread engagement zone. Apply PTFE tape or thread sealant to all male threads engaging the 1" FPT interior before installing downstream components. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Industrial Process Piping — Reduces a 1-1/4" FPT port on a tee branch, cross outlet, valve body, or equipment nozzle to a 1" male-threaded connection for ball valves, gate valves, check valves, strainer bodies, flow meters, and pump connections in chemical processing, water treatment, and manufacturing facility piping — the single most common application given the near-universal prevalence of 1" NPT ports on standard commercial and industrial equipment
• Commercial Plumbing — Installs at 1-1/4" FPT branch outlets on threaded tees, manifold assemblies, and valve bodies in mechanical room and building water distribution piping to interface directly with 1" NPT shutoff valves, pressure gauges, backflow preventer inlets, and fixture supply branch fittings without intermediate adapters
• Pump & Equipment Connections — Bridges a 1-1/4" FPT port to a 1" NPT pump inlet, discharge fitting, strainer body, or equipment nozzle in process and mechanical systems where the single pipe-size step between port and component is most efficiently handled by a single reducing bushing rather than an adapter-plus-coupling assembly
• Water & Wastewater Treatment — Provides a compact all-threaded one-step size reduction at 1-1/4" FPT ports on process headers, chemical dosing manifolds, filter vessel connections, and instrumentation runs along Schedule 80 PVC threaded piping in municipal and industrial water treatment facilities
• Chemical Handling & Dosing Systems — Delivers a corrosion-resistant threaded size reduction at 1-1/4" FPT ports on chemical feed manifolds, reagent distribution headers, and tank outlet fittings where downstream valves, injectors, and flow meters present 1" male-threaded inlets in systems handling acids, caustics, and aggressive process fluids
• Irrigation & Agricultural Systems — Reduces 1-1/4" FPT branch ports on threaded tees and zone header manifolds to 1" male-threaded connections for control valves, filter housings, fertigation injectors, and pressure regulators in commercial irrigation, greenhouse, and agricultural water supply systems
• HVAC & Mechanical Systems — Installed at 1-1/4" FPT ports on threaded Schedule 80 PVC cooling tower makeup lines, treated water distribution headers, and glycol system branch connections where a compact all-threaded one-step reduction to 1" is required at valve, strainer, and equipment connection points