Reducer Bushing, Spigot x Slip PVC Schedule 40 1" x 3/4" (437-131)

This 1" x 3/4" Schedule 40 PVC Reducer Bushing (Spigot x Slip) provides a compact, all solvent-cement near-full-size transition from a 1" socket fitting hub down to a continuing 3/4" socket pipe run — consolidating a modest 1.33:1 step-down and the hub-to-pipe transition into a single all-socket fitting body without the need for a separate reducer coupling, inline bushing chain, or multi-piece transition assembly at the reduction point. Constructed in white Schedule 40 PVC, it delivers the most common adjacent-size socket hub reduction in residential and light commercial PVC distribution systems — appearing throughout irrigation grid assemblies, fire suppression headers, commercial plumbing socket distribution runs, and light industrial process water assemblies wherever a 1" socket fitting hub must supply a continuing 3/4" socket pipe run in all-socket cemented construction.

The 1" spigot (male plain end) is sized to insert directly into the hub of any standard 1" socket-end fitting — tee branch outlet, cross port, coupling end, elbow outlet, side outlet elbow port, or valve body — and is solvent-cemented in place to form a permanent, leak-free joint at the outer face of the hub. The 3/4" slip socket outlet accepts 3/4" PVC pipe for a permanent solvent-cement bond on the downstream reduced-diameter pipe run, completing the all-socket size transition in a single cemented fitting body. This Spigot x Slip all-socket configuration is the correct choice when both the upstream 1" assembly and the downstream 3/4" continuation are all-socket cemented PVC construction — distinct from the 438-131 (1" x 3/4" Spigot x FPT, confirmed in this catalog session), which cements into the same 1" socket hub but provides a 3/4" female-threaded outlet for a male-threaded downstream component rather than a socket pipe run; from the 439-131 (1" x 3/4" MPT x FPT Hex Bushing, confirmed in this session), which threads into a 1" female-threaded port rather than cementing into a socket hub; and from the 838-131 (1" x 3/4" Schedule 80 Spigot x FPT, confirmed in this session), which is the dark gray Schedule 80 counterpart at the same hub inlet size serving higher-pressure applications. The 437-131 is the only confirmed all-socket outlet configuration in the four-series 1" x 3/4" fitting family — specifically the correct choice when the downstream 3/4" connection must continue as a cemented socket pipe run rather than connect to any threaded component. The 1" to 3/4" step-down is the most common adjacent-size all-socket hub reduction in residential and light commercial PVC assemblies — appearing at 1" tee branch outlets, cross ports, and manifold hubs throughout irrigation grid assemblies where a 3/4" socket sub-lateral or zone supply run must originate at a 1" socket fitting hub; in fire suppression systems where a 3/4" socket branch lateral departs from a 1" socket grid header hub; and in commercial plumbing socket distribution assemblies where a 3/4" socket branch supply run must be served off a 1" socket distribution main fitting hub.

Rated to approximately 450 psi at 73°F (governed by the 1" spigot end), this bushing is suited for standard commercial and light industrial water distribution and irrigation service within its pressure class. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to the spigot exterior and the interior of the receiving 1" socket hub per ASTM D2564 procedures, inserting fully and holding briefly for initial set. Apply solvent cement separately to the 3/4" pipe end exterior and the fitting's slip socket interior before inserting the pipe fully and maintaining a quarter-turn during assembly. Allow adequate cure time on both cemented joints before pressurizing the system, and derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Irrigation & Water Distribution — Steps down 1" socket tee branch outlets, cross ports, manifold hubs, and valve body socket ports to a continuing 3/4" socket PVC pipe run in residential, agricultural, and municipal irrigation systems where a 3/4" socket zone supply lateral, sub-lateral distribution run, or service branch must originate directly at a 1" socket fitting hub in all-socket cemented construction — the most common adjacent-size all-socket hub reduction at the dominant 1" grid header diameter
• Fire Suppression Systems — Transitions 1" socket tee branch outlets, cross port hubs, and grid header fitting ports to continuing 3/4" socket lateral branch lines, sprinkler head supply runs, and zone distribution laterals in light-hazard and residential Schedule 40 PVC fire suppression systems where all-socket cemented construction is maintained throughout and the 1" to 3/4" adjacent-size hub reduction is the standard lateral supply transition at 1" grid fitting hubs
• Commercial Plumbing — Transitions 1" socket fitting hub branch outlets and manifold ports to continuing 3/4" socket dedicated zone supply, branch distribution, and small-bore service pipe runs in commercial building water distribution systems where all-socket PVC construction is maintained throughout and the 1.33:1 hub reduction supplies a 3/4" socket branch run in a single compact fitting at the hub location
• Industrial Process Piping — Steps down 1" socket fitting hub branch outlets and manifold ports to continuing 3/4" socket process water distribution runs, service branch assemblies, and equipment feed approach lines in water treatment, chemical processing, and manufacturing facilities where all-socket cemented construction is maintained at every hub reduction point throughout the system
• Water Treatment & Aquaculture — Used at 1" socket tee branches, cross ports, and manifold hub outlets where the downstream 3/4" socket run must be supplied in a single all-cemented compact fitting with NSF/ANSI 61 compliance required throughout the all-socket assembly at the standard adjacent-size hub reduction
• Chemical Handling — Delivers a corrosion-resistant all-socket hub-to-run transition in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings or threaded transitions, where a 3/4" socket downstream run must originate directly at a 1" socket fitting hub without a threaded interface at the reduction point