I am trying to unhook a gas stove flex line. The joint B turns fine so I can unthread it. However the joint A seems to be seized and won’t turn. As a result, I cannot remove the hose as the hose cools on itself. What am I doing wrong? Is there a way to loosen this joint so that the connection turns freely at the flex line and doesn’t twist when I turn the nut? Thanks.
EDIT: To aid others who had trouble removing this, added photo to show how this was finally undone, with help of this amazing group. Thanks @AlaskaMan. Basically the connection was between two chrome hex parts and it was just too tight. I was afraid to break it but the answers here gave me confidence to just go with it. Make sure you have a couple of good pipe wrenches.
Best Answer
A is the fitting on the yellow gas line,
B is the nipple on the black pipe.
The two are made to go together, it is a flared compression fitting and does not flex.
Threaded joints explained.
How to wrap PTFE tape.
a wrench on the nipple (B) holds it from moving while a wrench on fitting (A) turns the fitting counterclockwise. Being a flared connection it does not get pipe dope when you reinstall it.
Since you have loosened B you will need to reset it. It does get pipe dope or PTFE tape (Teflon) made for gas. It appears white water Teflon tape was used.
After you get A and B apart, take B off of the black pipe and thoroughly clean off the threads, apply PTFE tape for gas connections OR pipe dope (not both) and reset B onto the black pipe. It will be helpful to have a PIPE wrench on the black pipe while you tighten the B nipple down. How to use a pipe wrench.