Step 3 · Remove the Old Angle Stop
Now you will remove the old valve from the copper pipe stub-out coming from the wall. This requires two wrenches. Use one wrench (e.g., a pipe wrench or large adjustable wrench) to grip the valve body securely to provide counter-torque. Use a second adjustable wrench to grip the large compression nut located behind the valve body. Turn the second wrench counter-clockwise to loosen the nut. This may require significant force if the valve is old. Once the nut is loose, unscrew it completely and slide it back on the pipe. The old angle stop should now pull straight off the copper pipe.