Step 6 · Clean and Prepare the Copper Pipe
Once the old fittings are off, thoroughly clean the end of the copper pipe stub-out. Use a piece of emery cloth or fine-grit sandpaper to polish the outside of the pipe where the new ferrule will sit. The goal is to remove any old pipe dope, corrosion, or burrs, creating a perfectly smooth surface for a watertight seal. Wipe the pipe clean with a dry rag when finished.