PVC Plug, 3/4 Mipt

Sometimes the job calls for closing off a line rather than extending it, and this American Granby PVC plug is the simple solution. It threads into any 3/4" female (FIPT) port to seal it cleanly, with a male iron pipe thread (MIPT) connection that screws straight into the matching threaded fitting. The molded body typically includes a square or hex boss so you can drive it snugly with a wrench and remove it again when needed.

An everyday problem-solver

Plugs like this turn up constantly in water-treatment plumbing. Use one to cap an unused outlet on a manifold, blank off a spare tee branch, seal a test or drain port between service intervals, or close a section of new pipe to pressure-test it before commissioning a softener or filter. Keeping a few on hand makes it easy to reconfigure a system or temporarily isolate a line without cutting and re-gluing pipe.

• Connection: 3/4" MIPT (male iron pipe thread)
• Fitting type: plug
• Material: Schedule 40 PVC
• Seals off any 3/4" FIPT port or fitting
• Great for capping spare outlets and pressure testing
• Light and compact at roughly 0.03 lb each

For a watertight seal, apply PTFE thread tape or pipe dope to the male threads and tighten by hand, then add a careful final turn with a tool, stopping before the plastic strains. Because PVC will not rust or seize the way a steel plug can in treated, chlorinated, or brine-laden water, you can usually back it out later without a fight when you need to reopen the port. That removability makes it a smart choice for stub-outs and test points you expect to revisit. Inexpensive and corrosion-proof, this American Granby plug is a handy way to keep treated-water systems sealed and serviceable in homes and light-commercial settings.

Because PVC will not corrode internally, the inside diameter stays clean and full-bore for the life of the line, preserving the flow and pressure that metal pipe loses to scale and rust over the years. That matters in water-treatment plumbing, where consistent flow keeps softeners and filters operating within their design range. Pair this fitting with quality pipe, proper primer and cement, and clean, square cuts, and it will deliver dependable, leak-free service for the long term.