Step 10 · Final Test and Cleanup

If there are no leaks with the valve closed, it's time for the final test. Slowly turn the handle on the new angle stop a quarter turn to the open position (the handle should be parallel to the pipe). Water will now flow to the faucet. Turn the faucet on and let it run for a minute, purging any air from the line. While the water is running, perform one last, thorough check for leaks around the valve, its stem, and both connections. If everything is dry, you have successfully replaced your angle stop. Clean up your tools and dry the area under the sink.