Step 9 · Restore Water and Check for Leaks
Double-check that the new angle stop's handle is in the closed (off) position. Go back to your main water shutoff and turn it on SLOWLY. Let the pipes fill with water gradually to prevent water hammer. Listen for any sounds of rushing water. Go back to the sink and meticulously inspect the new valve for any signs of water, no matter how small. Check around the large compression nut and the faucet supply line nut. If everything is dry, place a dry paper towel under the valve, then slowly turn the handle on the new angle stop to open it. Let the water run at the faucet for a minute to clear out any air. Perform one final check for leaks at all connections.