Step 4 · Clean and Deburr the Pipe Ends

This is the step people usually slow down on. Go finger-tight first, then a quarter turn. No rush — replay the clip whenever it helps.

After cutting, the pipe ends will have sharp edges (burrs) on the inside and outside. Use a deburring tool (often integrated into the tubing cutter) or a round file to smooth the inside edge of both pipe ends. Then, use a piece of emery cloth or fine-grit sandpaper to thoroughly clean and polish the outside of the pipe ends, about 1 inch back from the cut. The copper should be shiny and completely free of burrs, paint, corrosion, or any imperfections. This clean surface is critical for the compression ferrule to create a watertight seal.