soldering copper pipe on a shower mixing valve. | DIY Home ...
flipping slumlord. Joined Jan 6, 2009. ·. 5,116 Posts. #2 · May 13, 2012. Ed911 said: There is a warning on the valve that says, caution, excessive heat will melt plastic internal parts... I was told to disassemble the valve and sweat the up-pipe and tub plug in place, and then reassemble the mixing valve...