How To Replace A Sink Shutoff Valve With A Compression Valve

Posted on: 4 March 2018

Shutoff valves may stick or otherwise become inoperable over time, leading to either low water pressure on the inability to shut off the water to the supply line in case of emergency. Each scenario can be avoided through the installation of a compression valve, which requires no soldering.

Compression fittings are also referred to as "push-in" fittings because you can simply push the end of a piece of copper, CPVC, or PEX pipe into a compatible compression fitting for a permanent leak-free seal.

Here's what you'll need to do to replace an old soldered shutoff valve with a compression valve.

What You Will Need

The supplies are based on a typical 1/2 inch supply line valve, and include:

  • 1/2" X 3/8" compression shutoff valve (Sharkbite is a popular brand of compression fittings)
  • Deburring and depth gauge tool for compression fittings
  • Small copper pipe cutter
  • Sharpie marker
  • Teflon tape
  • Sandpaper
  • Pliers or an adjustable wrench (if needed)

You will also need some rags or paper towels to absorb any water in the pipe that will spill out after the old valve is cut off.

Removing the Old Valve

The most important step in the process is to turn the water off to the supply line at a further location from the faucet. You may need to turn off the main valve to the home if no further shutoff valves can be located. Once this is done, open the faucet completely to drain as much water from the pipe as possible.

You will then open the copper cutter sufficiently to place the cutting wheel under the pipe in the area that you intend to cut. You can then begin to tighten the handle of the cutter gradually until the cutting wheel cuts through the pipe.

You will then place the 1/2" opening of the deburring tool over the cut end of the pipe and twist it back and forth to remove burrs and smooth rough edges. Next, you will insert the pipe fully into the deburring tool and mark the pipe with a sharpie at the point where it enters the tool. 

This mark will provide the proper insertion depth when the end of the pipe is placed inside the compression valve fitting. You will then use sandpaper to thoroughly clean the end of the pipe to the depth mark.

Installing the New Valve

You will first need to disconnect the supply hose from the old valve by turning the hose connector in a counterclockwise direction until it is released. You may need a pair of pliers or a wrench if it's difficult to remove.

When this is done, wrap Teflon tape in a clockwise direction around the threaded end of the compression valve fitting until all threads are covered. Make sure that the valve handle is in an upright position, then connect the supply hose by turning the connector in a clockwise direction until fully tightened.

You will then push the compression connection onto the end of the copper pipe until it reaches the depth mark that you made using the depth gauge/deburring tool.

You can then turn on the water supply, clean up your mess, and test out the new valve because you're finished. Contact a company like Midwestern Plumbing Service for more information and assistance.