Step 3 · Disconnect the Faucet Supply Line
Using an adjustable wrench, grip the nut that connects the faucet supply line (the flexible or rigid tube going up to the faucet) to the outlet of the leaky angle stop. Turn the nut counter-clockwise to loosen it. Hold the valve body with your other hand to prevent it from twisting. Once the nut is loose, you should be able to unscrew it by hand. Pull the supply line away from the valve and tuck it out of the way. A small amount of water will drain out into your bucket.