Step 4 · Clean Pipe & Remove Old Hardware
With the old valve removed, slide the old compression nut off the pipe. You will see a small brass ring, the ferrule (or compression sleeve), on the pipe. It is best practice to remove this and use the new one that comes with your new valve. A dedicated compression sleeve puller is the ideal tool for this, as it removes the sleeve without damaging the pipe. If you don't have one, you can try carefully cutting a slot in it with a small hacksaw (being careful not to cut the pipe) or prying it off. Once the old hardware is removed, take a piece of emery cloth and thoroughly clean the end of the copper pipe until it is bright and smooth. This creates a clean surface for the new seal.