I'm at the stage of my remodel where I need to upgrade a few of the plumbing runs. In previous upgrades, some of the galvanized water lines were connected to the CPVC plumbing. This is what I intend to do in the bathroom. I need to disconnect a few of the threaded connections, but can't seem to bust them loose. Are there any tips for loosening them up? I have soaked the joints with WD-40 and tried some heavy duty pipe wrenches, to no avail. My next thought was to try a torch on the joint to heat it up. Any suggestions? Thanks in advance!