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Water valve under sink won t shut off.
First make sure that you shut off the water that supplies the valve you re going to be working on.
Place a folded piece of paper towel on the adjustable wrench jaws or wrap it around the shutoff valve prior to moving.
This tip if followed will work 85 percent of the time.
Prevent shutoff valves from freezing or becoming stiff by turning the valve on and off twice a year.
Here is a video showing you how to handle a situation in which the water shut off valve or angle stop does not want to close or shut off.
If there s buildup visible on the water valve pour a little white vinegar on the valve and scrub the buildup away with a wire brush.
A water supply valve that won t work or leaks when it is shut can be repaired.
If your water supply valve is leaking you may not need to replace it.