Reducer Bushing, Spigot x Slip PVC Schedule 40 2-1/2" x 1" (437-289)

This 2-1/2" x 1" Schedule 40 PVC Reducer Bushing (Spigot x Slip) provides a compact, all solvent-cement transition from a 2-1/2" socket-end fitting hub down to a 1" PVC pipe run, consolidating a meaningful 2.5:1 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 2-1/2" spigot (male plain end) is sized to insert directly into the hub of any standard 2-1/2" 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 2-1/2" 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 the 438-289 (Spigot x FPT, same size), which provides a 1" female-threaded outlet for connecting to male NPT-threaded components directly off the fitting hub, or with MPT x FPT hex bushings, which are installed entirely within threaded assemblies. The 2-1/2" to 1" step-down is a meaningful 2.5:1 reduction to one of the most widely specified full-service socket pipe run sizes — most commonly encountered at 2-1/2" tee or cross branch outlets serving 1" dedicated distribution branches, zone supply laterals, equipment feed lines, and moderate-flow service runs that tap off a 2-1/2" socket mainline assembly in a single all-cemented fitting transition where maintaining the all-socket integrity of the system is a design priority.

Rated to approximately 160 psi at 73°F (governed by the 2-1/2" 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 2-1/2" 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" socket zone supply branches, dedicated lateral distribution runs, and moderate-flow service connections off 2-1/2" socket-end mainline tees and crosses in agricultural and municipal irrigation systems where an all solvent-cement 2.5:1 reduction is preferred at the socket fitting port and the downstream 1" socket pipe run must carry moderate-to-full flow to a zone header or lateral distribution assembly
• Commercial Plumbing — Reduces 2-1/2" socket-end tee branches and fitting ports to 1" PVC socket pipe runs at equipment feed connections, moderate-flow fixture supply headers, and branch distribution sub-mains in commercial building water distribution systems where all-socket PVC construction is specified throughout and no threaded interface is required at the reduction point
• Industrial Process Piping — Provides an all solvent-cement large-to-moderate socket transition at pump suction feed connections, process water branch supply lines, and 1" dedicated service branches off 2-1/2" socket process water headers in water treatment, chemical processing, and manufacturing facilities where all-cemented Schedule 40 PVC construction is maintained and no threaded interface is required at the reduction point
• Chemical Handling — Delivers a corrosion-resistant, all solvent-cement socket reduction in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, particularly where a 1" socket pipe run must branch off a 2-1/2" socket distribution main without any threaded interface at the transition — preserving the all-cemented integrity of chemical distribution and dosing assemblies
• Water Treatment & Aquaculture — Used at filter manifold branch outlets, recirculating system header taps, and tank distribution assemblies where a 2-1/2" socket fitting must supply a 1" socket pipe run to a treatment component, pump feed line, or moderate-flow distribution branch requiring NSF/ANSI 61 compliance and an all-cemented assembly throughout
• HVAC & Mechanical Systems — Transitions 2-1/2" socket-end fitting ports to 1" PVC pipe runs at moderate-flow branch connections, equipment feed stubs, and service lateral step-downs on cooling tower supply headers, chilled water distribution mains, and chemically treated water systems within the Schedule 40 pressure class where all-socket construction is preferred