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When an open pipe end causes leaks, pressure loss, or safety hazards, DIYers and tradespeople alike need a dependable PVC NPT male thread end cap they can trust. These pipe stop fittings are designed for homeowners, plumbers, and irrigation installers who need a clean, permanent seal on exposed pipe ends without the complexity of solvent welding.
Each PVC NPT male thread end cap is molded from rigid PVC (polyvinyl chloride) with a tapered NPT (National Pipe Taper) male external thread. Available in five pipe sizes — 20mm (1/2"), 25mm (3/4"), 32mm (1"), 40mm (1-1/4"), 50mm (1-1/2"), and 63mm (2") — and in White or Grey finish. The threaded body typically measures 18–70mm in overall length depending on size, with wall thickness ranging from approximately 3–6mm.
Typical use cases include capping unused branch outlets on PVC irrigation manifolds, sealing off decommissioned water supply lines in residential plumbing, and temporarily or permanently closing pipe ends during pressure testing of cold-water distribution systems.
| Material | Rigid PVC (Polyvinyl Chloride) |
|---|---|
| Thread Type | NPT (National Pipe Taper) — Male External |
| Available Sizes | 20mm (1/2"), 25mm (3/4"), 32mm (1"), 40mm (1-1/4"), 50mm (1-1/2"), 63mm (2") |
| Colour / Finish | White; Grey |
| Wall Thickness | Typically 3–6mm (varies by size) |
| Overall Length | See variant options |
| Working Pressure | See variant options |
| Temperature Range | 0°C – 60°C (32°F – 140°F) for cold-water use |
| Connection Standard | NPT (ANSI/ASME B1.20.1) |
| Pack Quantities | 1 pc / 5 pcs / 10 pcs / 50 pcs |
| Application | Cold-water plumbing, irrigation, low-pressure pneumatics |
Match the size to your pipe's nominal diameter: 20mm = 1/2", 25mm = 3/4", 32mm = 1", 40mm = 1-1/4", 50mm = 1-1/2", 63mm = 2". If you are unsure, measure the outer diameter of your pipe and compare it to the nominal size chart, or check the markings printed on the pipe itself.
Yes. Wrap 2–3 layers of PTFE (plumber's) thread tape clockwise around the male threads before installation. This fills the thread gaps and creates a watertight seal. Avoid over-tightening, which can crack the PVC body.
Yes. These caps feature a standard NPT male taper thread (ANSI/ASME B1.20.1) and will thread directly into any NPT female socket, valve, or fitting of the matching nominal size — whether PVC, brass, or stainless steel.
Yes. PVC is inherently resistant to moisture, soil contact, and common fertilizer chemicals used in irrigation systems. For above-ground outdoor installations exposed to prolonged UV sunlight, consider painting the fitting or using UV-resistant pipe wrap to extend service life.
Working pressure varies by pipe size and wall schedule. As a general guide, rigid PVC NPT fittings in residential sizes are rated for cold-water pressures typically between 150–300 PSI at room temperature. Pressure rating decreases as temperature increases. Contact us to confirm the rating for your specific size and application.
Both colours are made from the same rigid PVC compound and offer identical mechanical performance. White is the conventional colour for potable (drinking) water plumbing systems. Grey is commonly used for electrical conduit, drainage, and non-potable water applications. Choose the colour that matches your existing pipework.
Yes. These threaded end caps are well-suited for temporary capping during hydrostatic pressure tests on cold-water systems. Apply PTFE tape, hand-tighten firmly, and remove after testing. Inspect the threads before reuse to ensure no deformation occurred during the test.
