Bushing, Spigot x Slip (Flush Style) PVC Schedule 80 3" x 1" (837-335)

The 3" x 1" PVC Schedule 80 Flush Style Bushing Spigot x Slip (837-335) provides a compact, low-profile inline size reduction from a 3" socket fitting to a 1" pipe continuation in a single fitting, with a flush-mount profile that seats entirely within the receiving socket rather than protruding beyond the fitting face. Manufactured from rigid gray PVC conforming to ASTM D1784 Cell Class 12454, this bushing is engineered for the pressure ratings, chemical resistance, and dimensional demands of industrial, municipal, and commercial Schedule 80 PVC piping systems.

The spigot (SPG) end is sized to the outside diameter of 3" Schedule 80 pipe, inserting directly into any standard 3" PVC socket fitting—such as a coupling, tee, cross, elbow, or valve body—as the male solvent-weld member of that joint. Once the spigot end is solvent-cemented into the receiving 3" socket, the bushing becomes a permanent, pressure-rated component of the fitting assembly. The slip (socket) end on the outlet then accepts standard 1" Schedule 40 or Schedule 80 PVC pipe via solvent cement, continuing the reduced pipe run from that point forward.

The flush style profile is the defining construction distinction from a standard hex head bushing. Where a hex bushing presents a raised shoulder that protrudes beyond the face of the receiving socket—adding axial length and requiring clearance for the hex flats—the flush style bushing eliminates the protruding shoulder entirely. The bushing body seats flush to or recessed within the receiving fitting face, producing a compact, streamlined assembly that is particularly valuable in tight equipment spaces, instrument manifolds, prefabricated skids, and densely plumbed valve trains where the protrusion of a hex shoulder would create dimensional interference or force an assembly layout redesign.

At 3" x 1", this bushing executes a substantial three-nominal-size reduction in a single fitting. This is the largest reduction ratio in the 3" spigot flush bushing group and serves a specific set of applications where a large-diameter main or manifold fitting must transition directly to a small-diameter instrumentation, sampling, chemical injection, or auxiliary service connection. The ability to make this transition with a single flush-profile fitting—rather than staging two or three reducing bushings in series or using a reducing tee with a separate bushing—minimizes fitting count, eliminates intermediate joint surfaces, and delivers the most compact possible assembly at this size reduction.

The significant flow area reduction from 3" to 1" means this bushing is generally appropriate for low-flow branch connections, instrument taps, chemical injection ports, sample points, and auxiliary service takeoffs from larger headers rather than for main-line flow continuations where the 1" outlet would create a substantial restriction. In manifold and header assemblies, the 837-335 is well suited for tapping a small-diameter instrument or injection line directly off a large socket fitting in a single, compact step.

Schedule 80 construction maintains consistent pressure class with surrounding Schedule 80 pipe and fittings throughout the system. Gray PVC delivers broad resistance to acids, bases, salts, and a wide range of industrial process fluids. For service temperatures above 140°F, consult CPVC Schedule 80 equivalents.

Specifications:

Industries & Applications:

• Chemical Processing — Large-to-small instrument tap and chemical injection port connections off 3" process headers and manifold socket fittings where a single flush-profile bushing provides the most compact transition to a 1" service line
• Water & Wastewater Treatment — Sample port, chemical injection, and instrumentation takeoffs from 3" Schedule 80 pump station and treatment plant headers where a compact, low-profile 3" to 1" reduction is required
• Industrial Manufacturing — Prefabricated Schedule 80 spool assemblies and process manifolds where a 3" header socket fitting must transition to a 1" instrument, gauge, or auxiliary service connection in a space-constrained assembly
• Irrigation & Agriculture — Chemical injection and fertigation metering line takeoffs from 3" Schedule 80 pump station and mainline header socket fittings on commercial irrigation systems
• Municipal Infrastructure — Instrumentation, sampling, and auxiliary service connections off 3" Schedule 80 mains at lift stations, treatment plants, and distribution system monitoring points
• Aquaculture & Aquatics — Recirculating system monitoring, dosing, and aeration line connections off 3" header socket fittings in compact mechanical assemblies where a flush-profile bushing minimizes space requirements
• HVAC & Plumbing — Commercial mechanical systems with Schedule 80 PVC piping requiring a flush-profile 3" to 1" reducer at instrument connections, gauge ports, or auxiliary service takeoffs from large-diameter headers