Step 2 · Disconnect Faucet Supply Line
Place a bucket directly under the angle stop you intend to replace to catch any residual water left in the supply line. Keep several rags handy to clean up any spills. Use a pair of channel-lock pliers or an adjustable wrench to loosen the coupling nut that connects the flexible faucet supply line to the top outlet of the angle stop. Turn the nut counter-clockwise. Once loose, finish unscrewing it by hand and gently pull the supply line away from the valve.