Unsoldering a copper fitting | DIY Home Improvement Forum
Joined Mar 15, 2005. ·. 1,460 Posts. #2 • Apr 12, 2007. You heat the fitting, not the pipe, to solder or "unsolder" copper. The most usual problem with soldering or unsoldering copper is water in the line. Cut the line, and make certain that it is completely drained. Good lucK!