Step 8 · Restore Water and Test for Leaks
The final step is to test your work. Ensure the new angle stop is in the closed position (handle perpendicular to the water line). Close all the faucets you opened earlier. Go to your main water shutoff and turn it on slowly, turning it counter-clockwise until fully open. Return to the sink and use a flashlight and a dry paper towel to inspect every connection point on the new valve for any signs of moisture or dripping. Wipe everything down and check again after a minute. If all is dry, slowly turn the handle on the new angle stop to the open position (parallel to the water line). Let the water run at the faucet to purge any air from the line. Check one last time for any leaks around the valve handle, compression nut, and supply line connection.