Step 3 · Remove Old Angle Stop Valve
This step requires careful application of force. You will use two large wrenches to remove the old valve from the copper pipe stub-out. Place one wrench (a pipe wrench or large channel-locks work well) on the body of the valve itself, positioned to prevent the valve from turning. Place your second wrench (an adjustable wrench is good) on the large compression nut that is right against the wall or escutcheon plate. Turn this nut counter-clockwise. It may be very tight and require significant force to 'break' loose. Once it breaks free, continue to unscrew the nut. Once the nut is fully loosened, you can slide the entire old valve assembly off the end of the copper pipe.