An angle stop is a shut off valve that is used to turn on and off the hot and cold water supply under the kitchen and bathroom sinks. Angle stops are also used to turn the water supply to the toilet on and off. An angle stop should be replaced if it leaks, if it is corroded, if the handle won’t turn or if the handle turns without coming to a stop.
To change an angle stop:
- Turn off the main water supply to the house.
- Turn the faucet on the release the water pressure, then turn the faucet back off.
- Remove the flex line to the faucet, the ice line to the refrigerator, the dishwasher connection - everything that carries water from the angle stop.
- Hold the compression nut on the copper pipe with a wrench and hold the angle stop body with another wrench.
- Unscrew the compression nut from the angle stop body.
- Leave the compression nut on the copper pipe unless it is too corroded to reuse.
- Take the angle stop to the store to buy the exact replacement size.
- Screw the existing compression nut on the new angle stop using a wrench on both the compression nut and the angle stop body at the same time. (It usually requires a lot of effort to tighten the compression nut enough to prevent a leak. While applying a lot of pressure on the wrenches to tighten the compression nut, care must be taken to apply the pressure to both wrenches in a manner that neither slips off.)
- Reconnect the flex line etc. to the angle stop.
- Turn the angle stop off.
- Turn on the main water supply to the house about 20%.
- Check the angle stop for leaks.
- Turn the angle stop on and check for leaks.
- Turn on the main water supply to the house 100% and check for leaks.
It is a good idea to briefly glance at the plumbing under the sink and smell for any dampness each time the cabinet is accessed. Preventive maintenance under sinks is much less expensive than replacing water damaged cabinets.
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