Bushing, MPT x FPT (Flush Style) PVC Schedule 80 2" x 1-1/4" (839-250)

The 839-250 is a PVC Schedule 80 flush bushing that reduces a 2" female-threaded port or fitting down to a 1-1/4" male-threaded connection using an all-threaded MPT × FPT configuration. The 2" male NPT threads on the large end engage an existing 2" FPT fitting, valve body, tank outlet, or threaded port, while the 1-1/4" female NPT threads on the small end accept any standard 1-1/4" male-threaded fitting, nipple, or valve.

The 2" to 1-1/4" transition is the closest-step reduction in the 2"-large-end 839 flush bushing series — spanning a single half-step in nominal pipe sizing between the 2" large end and the 1-1/4" outlet. This makes the 839-250 the right selection when a minimal diameter change is all that is required: adapting a 2" valve port or fitting connection to an existing 1-1/4" downstream system, matching a 2" equipment outlet to 1-1/4" header piping, or providing a modest flow restriction at a branch tie-in point without introducing the abrupt cross-sectional area change of a larger reduction. In flow-sensitive systems, the closer size match between inlet and outlet means lower velocity increase and less turbulence through the fitting than any of the larger reductions in the series.

As with all 839-series fittings, the flush style is the defining characteristic that distinguishes this fitting from the 838 hex bushing series. The large end is fully threaded from face to face with no raised hexagonal shoulder, allowing the 839-250 to thread completely into a 2" FPT socket and sit flush or recessed below the socket face. In dense piping assemblies, threaded manifolds, panel-mounted equipment enclosures, or installations where a hex shoulder would conflict with adjacent valves, fittings, or structural elements, the flush profile is not just a preference — it is frequently a functional requirement.

Without hex flats on the large end, installation requires a strap wrench or chain wrench. PTFE thread tape or an approved pipe thread sealant should be applied to the male threads before engagement. The fitting should be started hand-tight, then advanced one to two additional turns with the strap wrench to achieve a pressure-rated seal. Threaded PVC demands significantly less installation torque than comparably sized metal pipe fittings — over-tightening is the most common cause of cracking at the thread root zone, and metal pipe wrenches bearing directly on the PVC body should always be avoided.

Manufactured from rigid PVC Type I, Grade I (Cell Classification 12454) to ASTM D2464, the 839-250 delivers broad corrosion resistance across acids, bases, salts, oxidizing agents, and a wide range of industrial process fluids. NSF/ANSI 61 certification confirms suitability for potable water contact. The 1-1/4" FPT small end governs the pressure rating for the assembled fitting at approximately 300 PSI @ 73°F. This is the lowest governing-end pressure rating among the four 2"-large-end 839 SKUs — a counterintuitive result for buyers unfamiliar with threaded PVC pressure rating behavior, where governing pressure decreases as outlet size increases rather than as outlet size decreases.

Specifications:

Industries & Applications:

• Industrial & Chemical Processing — Closest-step reductions from 2" valve ports, tank outlets, or manifold connections to 1-1/4" branch lines or equipment inlets in corrosive service environments; minimal velocity change through the fitting suits flow-sensitive circuits where larger reductions would introduce unacceptable turbulence
• Pump & Valve Bodies — Adapting 2" NPT pump suction or discharge ports to 1-1/4" downstream piping in a single compact fitting; one-step size match preserves flow efficiency and minimizes installed length at the connection point
• Water Treatment & Purification — NSF 61 listing supports potable water service; 2" to 1-1/4" transitions appear at filter housing inlets and outlets, treatment vessel ports, and distribution manifold branches where close-coupled size matching is preferred
• Chemical Metering & Dosing Systems — Reducing 2" storage vessel or pump outlets to 1-1/4" distribution headers on skid-assembled systems; flush profile suits enclosed or panel-mounted equipment layouts where hex shoulder clearance is unavailable
• Irrigation & Agricultural Infrastructure — Close-step reductions at 2" mainline valve bodies or filter housings connecting to 1-1/4" zone or lateral piping in large-format irrigation systems
• Commercial & Mechanical Plumbing — Transitioning 2" threaded fitting ports to 1-1/4" service connections in mechanical rooms and equipment assemblies; the close size match supports balanced flow distribution in multi-branch systems
• OEM & Skid-Mounted Equipment Fabrication — Low-profile close-step reduction for factory-built assemblies requiring a 2" port to transition to 1-1/4" field piping without a protruding hex shoulder creating clearance conflicts within the equipment enclosure