Bushing, MPT x FPT (Flush Style) PVC Schedule 80 2" x 3/4" (839-248)

The 839-248 is a PVC Schedule 80 flush bushing that reduces a 2" female-threaded port or fitting down to a 3/4" 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 3/4" female NPT threads on the small end accept any standard 3/4" male-threaded fitting, nipple, or valve.

The flush style is what separates the 839 series from the 838 hex bushing series in the same Schedule 80 lineup. A hex bushing carries a raised hexagonal shoulder at the large end — visible above the fitting socket face and requiring a standard open-end or adjustable wrench for installation. The 839 flush bushing has no such shoulder. Its large end is fully threaded from face to face with no hex flats, allowing it to thread completely into a fitting socket and sit flush or recessed without a protruding profile. This low-clearance design is preferable in congested piping arrangements, panel-mounted equipment, or threaded manifold assemblies where the hex shoulder of a standard bushing would interfere with adjacent components or fittings.

Because no hex flats are present, installation requires a strap wrench or chain wrench to develop adequate torque without damaging the fitting. PTFE thread tape or an approved pipe thread sealant should be applied to the male threads before assembly. Standard practice is hand-tight engagement followed by one to two additional turns with a strap wrench — threaded PVC does not tolerate the same torque levels as metal pipe fittings, and over-tightening is a leading cause of cracking at or near the thread engagement zone. Metal pipe wrenches should be avoided directly on the PVC body.

The 2" to 3/4" reduction this fitting provides is a significant multi-step step-down — spanning multiple pipe sizes in a single threaded component. This makes the 839-248 a compact solution for reducing large-body valve ports, tank outlets, or manifold connections to smaller-bore instrumentation, sampling lines, chemical injection points, or service connections without building out a staged reduction using multiple fittings and nipples.

Manufactured from rigid PVC Type I, Grade I (Cell Classification 12454) to ASTM D2464, the 839-248 provides broad corrosion resistance to acids, bases, salts, oxidizing agents, and many industrial process fluids. NSF/ANSI 61 certification confirms suitability for contact with potable water. As with all reducing threaded fittings, the smaller end — 3/4" FPT — governs the pressure rating for the assembly, and threaded PVC fittings carry somewhat lower rated working pressures than socket equivalents at the same schedule due to the reduced wall section at thread roots.

Specifications:

Industries & Applications:

• Industrial & Chemical Processing — Reducing large-body valve ports, tank outlets, and manifold connections to 3/4" instrumentation, chemical injection, or sampling lines in corrosive service environments where the flush profile prevents interference with adjacent components
• Water Treatment & Purification — NSF 61 listing supports potable water use; flush bushings appear at filter housing ports, treatment vessel outlets, and metered connection points where a recessed threaded profile is preferred over a protruding hex shoulder
• Chemical Metering & Dosing Systems — Compact reduction from 2" pump or tank ports to 3/4" injection or distribution lines; flush profile suits panel-mounted and skid-assembled dosing systems with tight spatial constraints
• Pump & Valve Bodies — Reducing 2" NPT ports on pump housings, valve bodies, or pressure vessels to 3/4" service connections without adding nipples or reducing couplings to the assembly
• Irrigation & Agricultural Infrastructure — Reducing main valve or filter body ports to 3/4" control valve, solenoid, or lateral connections in large-format irrigation systems
• OEM & Skid-Mounted Equipment Fabrication — Flush bushings are a preferred choice in factory-built equipment assemblies where a clean, low-profile threaded reduction is specified and hex shoulder clearance cannot be guaranteed at installation