Reducer Bushing, Spigot x Slip PVC Schedule 40 3" x 1" (437-335)

This 3" x 1" Schedule 40 PVC Reducer Bushing (Spigot x Slip) provides a compact, all solvent-cement transition from a 3" socket-end fitting hub down to a 1" PVC pipe run, consolidating a significant large-to-small diameter reduction into a single fitting body without the need for threaded connections, additional couplings, or multi-piece transition assemblies. Constructed in white Schedule 40 PVC, it offers reliable performance in commercial plumbing, irrigation, and light industrial installations where a corrosion-resistant, all socket-to-socket diameter reduction is required at an existing large-diameter fitting port and no threaded interface is needed at the transition point.

The 3" spigot (male plain end) is sized to insert directly into the hub of any standard 3" socket-end fitting — tee, cross, coupling, elbow, or valve body — and is solvent-cemented in place to form a permanent, leak-free joint at the outer face. The 1" slip socket interior accepts a 1" PVC pipe for a permanent solvent-cement bond on the reduced-diameter outlet side, completing the transition in a single compact body. This Spigot x Slip configuration is the all-solvent-cement approach to socket reducing at this size combination, and is the correct choice when both the upstream 3" assembly and the downstream 1" run are entirely socket-based PVC systems with no threaded interfaces required at the transition point. It should not be confused with any 438 series counterpart at this size (Spigot x FPT, 3" x 1"), which provides a 1" female-threaded outlet for connecting to male NPT-threaded components, or with MPT x FPT hex bushings, which are installed entirely within threaded assemblies. The 3" to 1" step-down is a meaningful 3:1 reduction — most commonly encountered at large-diameter tee or cross branch outlets serving 1" dedicated service lines, instrument supply runs, chemical injection feeds, and small-bore distribution branches that tap off a 3" mainline socket assembly in a single fitting transition.

Rated to 260 psi at 73°F (governed by the 3" spigot end), this bushing is suited for standard commercial and light industrial water distribution and irrigation service within its pressure class. Its PVC composition provides excellent resistance to corrosion, scale, chlorinated water, and a broad range of chemical exposures, making it a reliable long-term alternative to metal reducing bushings in moisture-prone or chemically active environments. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to the spigot exterior and the interior of the receiving 3" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. Apply solvent cement separately to the 1" pipe end exterior and the fitting's slip socket interior before inserting the pipe fully and maintaining a quarter-turn during assembly for even cement distribution. Complete each cemented joint in sequence and allow adequate cure time before pressurizing the system. Derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Irrigation & Water Distribution — Taps 1" small-bore service lines, drip feed laterals, solenoid valve inlets, and dedicated zone supply branches off 3" socket-end mainline tees and crosses in large-diameter agricultural and municipal irrigation systems where an all solvent-cement 3:1 reduction is preferred at the socket fitting port
• Industrial Process Piping — Provides an all solvent-cement large-to-small socket transition at chemical feed injection points, instrument supply lines, drain stubs, and 1" dedicated service connections branching off 3" process water socket assemblies in water treatment, chemical processing, and manufacturing facilities where no threaded interface is required at the reduction point
• Commercial Plumbing — Reduces 3" socket-end tee branches and fitting ports to 1" PVC pipe runs at fixture supply connections, pressure gauge feed lines, and small-diameter service branches in commercial building water distribution systems where an all-socket, no-thread assembly is specified or preferred
• Chemical Handling — Delivers a corrosion-resistant, all solvent-cement socket reduction in large-diameter systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, particularly where a 1" pipe run must branch off a 3" socket assembly without introducing a threaded interface at the transition point
• Water Treatment & Aquaculture — Used at filter manifold branch outlets, recirculating system header taps, and tank distribution assemblies where a 3" socket fitting must supply a 1" PVC pipe run to a dosing point, sampling connection, or small-diameter distribution branch requiring NSF/ANSI 61 compliance and an all-cemented joint is preferred
• HVAC & Mechanical Systems — Transitions 3" socket-end fitting ports to 1" PVC pipe runs at sensor supply connections, drain valve stubs, and small-diameter service branches on cooling tower supply headers, chilled water distribution manifolds, and chemically treated water systems within the Schedule 40 pressure class