Step 5 · Clean and Prepare the Pipe
After removing the old components, inspect the end of the copper pipe (the stub-out). Using a piece of emery cloth or fine-grit sandpaper, thoroughly clean the last inch of the pipe. Sand it until it's bright and shiny, removing any old pipe dope, mineral deposits, or minor scratches. A clean, smooth surface is essential for the new compression fitting to create a watertight seal. Once cleaned, wipe the pipe with a dry rag to remove any dust or debris.