Step 8 · Reconnect Supply Line and Test for Leaks
With the new angle stop still in the closed position, reconnect the faucet supply line to the valve's outlet and tighten it with your adjustable wrench until snug. Go back to the main water shutoff valve and turn it on slowly to allow the pipes to fill without causing a water hammer. Return to the sink and use a flashlight and a dry paper towel to inspect the connection where the valve meets the copper pipe. Wipe it thoroughly; if the paper towel stays dry, there are no leaks. Now, slowly open the new angle stop by turning the handle. Check for leaks again at the main connection, the faucet supply line connection, and around the valve's handle/stem. If everything is dry, your replacement is complete.
Tools and Materials
PrevNext