Bushing, Spigot x FPT (Flush Style) PVC Schedule 80 3" x 3/4" (838-334)

The 3" x 3/4" PVC Schedule 80 Flush Bushing (Spigot x FPT) provides a compact, pressure-rated transition from a 3" Schedule 80 socket fitting down to a 3/4" female NPT threaded port. The spigot end inserts directly into the socket of an existing 3" Schedule 80 fitting — eliminating the need for an additional coupling — while the 3/4" FPT socket accepts any standard 3/4" male NPT fitting, valve, instrument, or equipment connection. The flush style keeps the installed profile low, sitting flush with the face of the host fitting rather than protruding with the hex flats of a standard hex bushing.

What distinguishes the 838-series spigot x FPT bushing from both the 837-series (spigot x slip) and 839-series (MPT x FPT) is its connection combination: the permanent, socket-inserted spigot end seats into a solvent-welded system while the FPT outlet provides a threaded interface for components that must remain accessible, serviceable, or replaceable over the life of the system. This makes the 838-334 particularly well-suited for tapping instrument connections, pressure gauge ports, chemical dosing inlets, drain valves, and sampling taps off a 3" Schedule 80 solvent-welded fitting body — creating a threaded access point within a permanent solvent-weld system without requiring a drilled tap, saddle fitting, or additional threaded adapter.

The 3" to 3/4" size differential is substantial, making this one of the more aggressive reductions in the 838-series. In most system designs, a reduction of this magnitude at a single fitting is appropriate for branch or instrument connections where flow volume at the port is modest relative to the main line — pressure monitoring, chemical dosing, drain taps, and small-diameter secondary connections being the most common examples. Where higher branch flow is required, an intermediate reduction step or a larger-outlet bushing should be evaluated.

Manufactured to ASTM D2464 standards and listed under NSF/ANSI 14, the 838-334 is molded from dark gray Schedule 80 PVC compound, delivering the greater wall thickness, elevated pressure ratings, and broad chemical resistance that Schedule 80 specifications demand across industrial, chemical, and commercial service environments.

Specifications:

Industries & Applications:

• Chemical Processing — Installed in 3" Schedule 80 solvent-welded chemical distribution headers to provide a 3/4" threaded port for pressure gauge connections, chemical dosing inlets, sampling taps, and small-diameter secondary chemical feed lines in systems handling acids, bases, and aggressive industrial fluids
• Pump Systems & Mechanical Rooms — Used at 3" Schedule 80 pump discharge or suction fittings to add a 3/4" threaded gauge port, pressure relief connection, or auxiliary instrument tap without requiring a separate threaded fitting body or saddle connection on the main pipe run
• Industrial Manufacturing — Applied in process piping systems where a 3" Schedule 80 solvent-welded main must provide a compact, threaded 3/4" access point for instrumentation, drain valves, or secondary process connections at a fitting socket rather than a pipe wall penetration
• Municipal Water & Wastewater — Installed at 3" Schedule 80 fitting bodies in pump stations, treatment facilities, and distribution infrastructure where a 3/4" threaded branch is needed for pressure monitoring, chemical dosing, or sampling connections within a solvent-welded Schedule 80 system
• Commercial Plumbing — Used in mechanical room Schedule 80 piping where a 3/4" threaded drain valve, pressure gauge, or small-diameter equipment connection must be introduced at a 3" Schedule 80 fitting socket without adding bulk or extending the fitting assembly beyond the flush profile
• Water Treatment & Filtration — Provides a threaded 3/4" instrument or dosing port at 3" Schedule 80 fitting connections in multi-stage water treatment systems, filter manifolds, and chemical injection assemblies where compact, accessible threaded ports are required within permanent solvent-welded piping infrastructure