Step 3 · Deburr and Clean Pipe and Fitting
After cutting, a small ridge or 'burr' will be left on the inside edge of the pipe. Use the triangular reamer on the back of the tubing cutter or a dedicated deburring tool to remove this ridge. Next, take a piece of sand cloth or an abrasive pad and vigorously scrub the outside of the pipe end (about 1 inch back from the end) until it is shiny and free of any oxidation or discoloration. Then, use a wire fitting brush to clean the inside of the copper fitting with the same vigor until it is also bright and shiny. Do not touch the cleaned surfaces with your bare hands, as skin oils can contaminate the joint.