How Do I Fix A Leaky Sink Shut Off Valve??

Stop a valve from leaking by tightening the packing nut.

Wrap a rag around the nut, which is just under valve handle, grip it with adjustable pliers and turn it clockwise one-eighth turn.

This may compress the rubber and plastic parts inside enough to stop the leak.

If not, disassemble the valve.

Why does my shut off valve leak?

The packing nut is responsible for making a watertight seal where the valve stem meets the water line. So, if there is a leak at the valve stem, it most likely means the valve is not shut off all the way. The first thing you should do to stop the leak is to tighten the packing nut.

How do you fix a stop valve?


  • Shut the water off to the house.
  • Pull the handle off the shutoff valve using the screwdriver.
  • Loosen the gland nut behind the handle using the wrench.
  • Unscrew and remove the valve.
  • Screw in the new valve from the repair kit.
  • Tighten the gland nut back over the new valve with the wrench.

How much does it cost to replace a water shut off valve?

The main water shut off valve is $175 to $250 to replace. Most of this is labor as the materials fall under $25. This valve is required by code and necessary to work on most home plumbing issues. The first step in any plumbing repair project is shutting the water off.

Photo in the article by “Wikimedia Commons”