Male Adapter, MPT x Slip PVC Schedule 40 4" (436-040)

This 4" Schedule 40 PVC Male Adapter transitions a solvent-cemented PVC pipe system to a male NPT threaded connection, providing a clean, permanent slip-to-thread interface where a 4" PVC pipe run must terminate into a female-threaded valve, fitting, equipment port, or threaded coupling. The slip socket end accepts standard 4" PVC pipe for solvent cement joining, while the MPT end threads directly into any compatible 4" female-threaded (FPT) port without additional adapters.

Where the female adapter (FPT end) receives male-threaded components into the piping system, the male adapter does the inverse — it presents a male-threaded end that inserts into female-threaded ports on valves, pumps, tank fittings, flanged components, and threaded couplings. This makes the 436-040 the correct adapter selection wherever the receiving connection is female-threaded and the upstream piping is solvent-welded PVC. The two adapters are frequently used together at union-style transitions, flanged valve assemblies, and equipment connections where both sides of an interface require a threaded-to-socket conversion.

Manufactured in white Schedule 40 PVC, this adapter offers reliable service across a wide range of water handling, irrigation, and industrial applications where a durable, corrosion-resistant transition from solvent-welded pipe to a male-threaded port is required. PVC's resistance to acids, bases, salts, chlorine, and most common industrial chemicals provides a long service life in environments where metal adapters would corrode, seize on threads, or contaminate the fluid stream.

Rated to 220 psi at 73°F, this fitting handles standard pressure service across commercial plumbing, irrigation mainlines, water treatment, and process piping. NSF/ANSI 61 and NSF/ANSI 14 listings confirm suitability for potable water systems.

Large-Diameter Solvent Cement Notice — 4" Socket End: At 4", use a heavy-bodied PVC solvent cement formulated for large-diameter Schedule 40 applications. Apply a full coat of purple primer to both the pipe end and socket interior, then apply cement to both mating surfaces (wet-on-wet) without allowing the first coat to dry before joining. Insert the pipe with a slight twist and hold firmly for 30 seconds. Allow adequate cure time before pressurizing the joint, following the cement manufacturer's temperature and humidity guidelines.

Apply PTFE tape or compatible thread sealant to the MPT threads before engaging any female-threaded port. Hand-tighten plus one to two turns with a strap wrench — avoid over-torquing into PVC or metal female threads, as excessive force can crack the receiving fitting or the adapter body at the thread root. Apply published pressure derating factors for service temperatures above 73°F.

Specifications:

Industries & Applications:

• Commercial & Municipal Plumbing — Terminates a 4" solvent-welded PVC supply main at a female-threaded gate valve, butterfly valve, ball valve, or threaded coupling in commercial building water distribution and mechanical room piping systems; frequently paired with a female adapter on the opposing side of a valve or union assembly
• Irrigation & Agriculture — Connects a 4" solvent-cemented PVC mainline to female-threaded pump discharge ports, filter vessel inlets, flow control valves, and zone header couplings in large-scale commercial and agricultural irrigation systems
• Water & Wastewater Treatment — Provides a slip-to-MPT transition at female-threaded tank fittings, pump flanges, filter vessel connections, and process equipment inlets in municipal and industrial water treatment facilities where the upstream piping is solvent-welded Schedule 40 PVC
• Industrial Process Piping — Adapts PVC pressure piping to female-threaded instrumentation, flow meters, pressure regulators, and equipment inlets in chemical, agricultural, and light manufacturing process systems requiring corrosion-resistant pipe-to-thread transitions
• Fire Protection & Site Utilities — Used in underground and above-grade 4" PVC piping systems where a permanent socket-to-MPT transition is required at hydrant risers, backflow preventer inlets, utility service entries, and site water distribution connections
• Pool, Spa & Aquaculture — Transitions large-diameter PVC recirculation, filtration, and backwash piping to female-threaded pump connections, filter heads, multiport valve inlets, and manifold couplings in aquatic facility and water feature installations