Reducing Male Adapter, MPT x Slip PVC Schedule 40 2" x 1-1/2" (436-251)

This 2" x 1-1/2" Schedule 40 PVC Reducing Male Adapter (MPT x Slip) provides a direct transition from a 1-1/2" PVC socket pipe run to any standard 2" female NPT-threaded fitting, valve, pump port, or equipment connection in commercial and light industrial piping systems. Constructed in white Schedule 40 PVC, it offers the corrosion resistance and chemical compatibility required across a wide range of fluid handling applications where a smaller-diameter PVC pipe run must interface with a larger-diameter female-threaded system component without additional transition hardware or intermediate couplings.

The 1-1/2" slip socket end accepts a 1-1/2" PVC pipe for a permanent solvent-cement bond, while the 2" MPT exterior engages any standard 2" FPT or FIP female-threaded connection using NPT tapered thread geometry. This step-up reducing configuration — where the MPT end is larger than the slip socket — is distinct from the more common step-down reducing adapters and serves a specific transition function: connecting a smaller-diameter PVC pipe run to a larger-diameter female-threaded valve, pump inlet, filter housing, or equipment port without requiring a full-size 2" pipe run up to the connection point. This approach is practical in systems where a 2" female-threaded component is the specified equipment interface but the upstream pipe run is sized at 1-1/2" for flow, velocity, or cost considerations, and a direct socket-to-thread transition in a single fitting body is preferred over a two-piece coupling-and-adapter assembly.

Rated to 280 psi at 73°F (governed by the 2" MPT threaded end), this adapter 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 buildup, chlorinated water, and a broad range of chemical exposures, making it a reliable long-term alternative to metal adapters in moisture-prone or chemically active environments. NSF/ANSI 61 listing confirms suitability for potable water contact.

Apply solvent cement to both the pipe end and fitting socket per ASTM D2564 procedures, using a primer appropriate for the pipe and fitting schedule. Insert pipe fully into the socket and maintain a quarter-turn during assembly for even cement distribution across the joint surface. On the 2" MPT end, use a quality pipe thread sealant or PTFE tape and avoid over-torquing — PVC threads require hand-tight plus one to two turns; excessive force can crack the fitting. Allow adequate cure time on the cemented joint before pressurizing the system, and derate pressure ratings for elevated temperatures per published derating curves.

Specifications:

Industries & Applications:

• Irrigation & Water Distribution — Transitions 1-1/2" PVC socket pipe runs to 2" female-threaded pump inlets, filter housing connections, and valve station ports in agricultural and municipal irrigation systems where equipment is specified at 2" but the upstream distribution pipe run is sized at 1-1/2" for flow management or cost efficiency
• Commercial Plumbing — Connects 1-1/2" Schedule 40 PVC socket pipe runs to 2" female-threaded valves, backflow preventers, and equipment connections in commercial building water distribution systems where a step-up adapter provides a direct single-fitting transition to a larger-diameter threaded component
• Industrial Process Piping — Interfaces 1-1/2" socket PVC pipe runs with 2" female-threaded pump inlets, valve bodies, and equipment ports in water treatment, chemical processing, and manufacturing facilities where the upstream pipe diameter is smaller than the equipment connection size and a direct reducing adapter eliminates the need for an intermediate full-size pipe section
• Chemical Handling — Provides a corrosion-resistant reducing socket-to-thread transition in systems conveying acids, caustics, fertilizer solutions, and other fluids incompatible with metal fittings, particularly where 1-1/2" PVC distribution lines must interface with 2" female-threaded chemical feed equipment, pump inlets, and valve bodies
• Water Treatment & Aquaculture — Used at pump suction connections, filter housing inlets, and treatment equipment interfaces where a 1-1/2" socket pipe run must transition to a 2" female-threaded component and NSF/ANSI 61 compliance and corrosion resistance are required throughout the assembly
• HVAC & Mechanical Systems — Connects 1-1/2" socket PVC pipe runs to 2" female-threaded pump ports, valve bodies, and equipment connections on cooling tower supply headers, chilled water distribution mains, and chemically treated water systems within the Schedule 40 pressure rating class