Bushing, MPT x FPT (Flush Style) PVC Schedule 80 3" x 2-1/2" (839-339)

The 839-339 is a 3" x 2-1/2" PVC Schedule 80 flush style bushing with a 3" male pipe thread (MPT) inlet and a 2-1/2" female pipe thread (FPT) outlet, designed to reduce a 3" female-threaded port down to a 2-1/2" male-threaded connection within a single compact threaded fitting. The 3" MPT inlet threads directly into any standard 3" FPT fitting, valve, or equipment port, while the 2-1/2" FPT outlet accepts any standard 2-1/2" NPT male-threaded pipe, fitting, or equipment connection — creating a fully threaded, one-step reducing transition with no solvent welding required at either end.

Manufactured from rigid, dark gray PVC compound conforming to ASTM D1784 cell classification requirements, the Schedule 80 wall construction delivers higher pressure ratings and greater mechanical strength than Schedule 40 equivalents at the same pipe size. This makes the 839-339 the correct choice for high-pressure chemical lines, industrial process piping, and any Schedule 80 system where a threaded reducing transition must maintain full Schedule 80 pressure integrity throughout. PTFE thread tape or appropriate thread sealant should be applied to both the MPT inlet threads before engagement with the receiving FPT port, and to any MPT fitting assembled into the FPT outlet, to ensure leak-resistant seals at both thread interfaces.

The flush style designation distinguishes this bushing from a hex bushing — rather than a hex shoulder that extends proud of the fitting face, the flush bushing body sits flush within the receiving female port with no protruding hex wrench flats, creating a lower-profile installation in confined spaces and compact assemblies where a hex bushing's external shoulder would interfere with adjacent fittings, enclosure walls, or structural members. Among flush bushing SKUs at the 3" inlet size, the 839-339 performs a notably modest reduction — the 2-1/2" outlet is only a half-inch smaller than the 3" inlet, making this the appropriate bushing when a near-full-diameter transition is required at a threaded port. This distinguishes it from the 839-338 (3" x 2"), where a full one-inch reduction is needed, and positions the 839-339 for applications where minimal flow restriction at the reduction point is the primary requirement and the step-down exists to match equipment port sizing rather than to meaningfully reduce flow capacity. The all-threaded construction means both ends remain serviceable — the bushing can be removed and replaced without cutting pipe or disturbing upstream or downstream solvent-welded connections.

Specifications:

Industries & Applications:

• Industrial Process Piping — Near-full-diameter threaded reductions in high-pressure Schedule 80 chemical distribution, cooling water, and process fluid systems where a 3" equipment port must match a 2-1/2" pipeline connection with minimal restriction at the transition point
• Chemical Processing — Corrosion-resistant threaded reducing transitions in acid, caustic, and aggressive fluid service where all-PVC flush bushing construction eliminates metal corrosion, galvanic incompatibility, and contamination concerns at the reduction point
• Municipal Water & Wastewater — Matching 3" threaded equipment ports to 2-1/2" pipeline connections at pump stations, treatment facility equipment, and distribution system valve assemblies where a near-full-diameter reduction is required in a serviceable, low-profile fitting
• Irrigation & Agriculture — Threaded port-matching reductions in high-pressure mainline valve assemblies and pump station manifolds where a 3" equipment connection must interface with a 2-1/2" pipeline or valve assembly in a compact installation
• HVAC & Mechanical — Threaded reducing connections in chilled water and condenser water system valve assemblies and equipment tie-ins where flush style construction minimizes fitting profile and the half-inch reduction matches equipment port sizing to pipeline dimensions
• Water Treatment & Filtration — Near-full-diameter reducing connections at filter vessel nozzles, pump equipment ports, and valve assemblies in potable water and industrial water treatment systems where maintaining high flow capacity through the reduction point is a design requirement