How to Replace a Plumbing Stop & Pressure Fitting

Plumbing stops are pressure fittings designed to plug the end of a pipe when there's no fixture at the end. Stops can corrode over time, however, and may need to be replaced. Plumbing stops come in a variety of materials, but using a push-to-fit stop is the simplest method for plugging any pressurized plumbing pipe. Replacing a plumbing stop requires you to remove the old stop and fit the end of the pipe with the new one.

Marker
Hacksaw
Sandpaper
Push-to-fit pipe cap

Instructions

- 1
  Shut off the main water valve by turning the ball valve handle on the main line clockwise.
- 2
  Mark the pipe with the old stop about 3 inches below the end of the stop with a marker.
- 3
  Cut off the pipe on the mark using a hacksaw.
- 4
  Rub a fine-grit sandpaper around the end of the cut pipe to remove any burrs. On copper pipes, rub the sides of the pipe near the end until the copper shines. This will provide a clean surface for the new fitting.
- 5
  Place a push-to-fit stop on the end of the pipe. Press down hard on the fitting until it won't go down any farther. The compression ring inside the fitting will automatically create a watertight, pressure-tested seal.
- 6
  Turn on the main water by turning the ball valve counterclockwise.

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