How to Fix a Leaky Shutoff Valve Under a Bathroom Sink If You Can’t Tighten the Nut

Finding a leaky shutoff valve under your bathroom sink can be frustrating. Previously, I could simply fix the problem by tightening the nut behind the handle. This has worked for other valves in my house, but not this time. Water continued to leak from the nut and I realized that the valve was simply too old and failed to function properly. Replacement was the only solution. Here’s how I did it.

Required tools and materials

Steps to replace a leaking shut-off valve

1. Turn off the water supply

Before you begin, locate the main water supply valve and close it. Open the faucet to relieve pressure in the pipes and drain any remaining water.

2. Evaluate the old valve

Confirm the source of the leak. If the nut behind the handle does not stop the water, inspect the valve for signs of corrosion or wear. A worn valve should be replaced rather than repaired.

3. Cut the pipe

Use a pipe cutter to remove the old valve. Make a clean, straight cut to ensure the new SharkBite valve fits securely. Be careful to cut only the pipe, avoiding damaging surrounding materials.

4. Debur and Klin

Use a deburring tool to smooth the cut edges of the pipe. This prevents sharp edges from damaging the O-ring of the SharkBite fitting. Wipe the pipe with a cloth to remove debris and ensure a watertight connection.

5. Mark insertion depth

SharkBite fittings require precise installation to ensure a secure connection. Using a depth gauge, mark the correct depth on the pipe with a marker.

6. Install SharkBite Valve

Align the SharkBite valve with the pipe and push it firmly until it reaches the marked depth. The fitting locks into place using an internal mechanism, providing a tight seal without the use of tools or glue.

7. Turn on the water

Slowly open the main water supply valve and check for leaks. When installed correctly, the SharkBite fitting will hold securely and the leak should be fixed.

Replacing a leaking check valve may seem like a daunting task, but with the right tools and materials it is a simple process. The SharkBite Max Quarter Turn Angle Check Valve not only solved my leaky valve problem, but also made the repair process simple and efficient.