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Step 9 · Restore Water and Check for Leaks

The moment of truth. First, ensure the new angle stop is in the closed position and the sink faucet is also closed. Go back to your main water shutoff valve and turn it on SLOWLY. Turning it on too fast can cause a 'water hammer' effect that can damage pipes. Once the main is fully on, return to the sink. Carefully inspect the new angle stop, particularly around the compression nut and the supply line connection, for any signs of water. Use a dry paper towel to wipe every part of the connection; it will instantly reveal even the tiniest drip.

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Step 9 · Restore Water and Check for Leaks

The moment of truth. First, ensure the new angle stop is in the closed position and the sink faucet is also closed. Go back to your main water shutoff valve and turn it on SLOWLY. Turning it on too fast can cause a 'water hammer' effect that can damage pipes. Once the main is fully on, return to the sink. Carefully inspect the new angle stop, particularly around the compression nut and the supply line connection, for any signs of water. Use a dry paper towel to wipe every part of the connection; it will instantly reveal even the tiniest drip.

Tools and Materials

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How to Replace a Leaky Angle Stop (Shutoff Valve) Under Your Sink

Step 9 of 10·15 min left

Shut Off Main Water and Drain Pipes
15 mins2 itemsIntermediate
Disconnect Faucet Supply Line
5 mins4 itemsIntermediate
Remove the Old Angle Stop
15 mins4 itemsAdvanced
Remove Old Nut and Ferrule
15 mins2 items
Clean and Prepare Pipe Stub-Out
5 mins3 itemsBeginner
Install the New Angle Stop
5 mins1 itemsIntermediate
Tighten the Compression Fitting
5 mins2 itemsAdvanced
Reconnect the Supply Line
5 mins2 itemsBeginner
9
Restore Water and Check for Leaks
10 mins1 itemsIntermediate
10
Final Test and Cleanup
5 mins2 itemsBeginner
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