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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.

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  • Joint A isn't a joint. Are you referring to the joints below each of those indicators? One is where the white tape is on the iron, and the other is between the two hex sections.
    – isherwood
    Nov 2 '20 at 20:05
  • @isherwood yes, sorry, if this was asked confusingly. I meant, shouldn’t the section between A and B be spinning freely to allow flex line stay static? It is not spinning between the two chrome hex sections at all.
    – David
    Nov 2 '20 at 20:07
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    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. a wrench on B holds it from moving will a wrench on A turns A counterclockwise.
    – Alaska Man
    Nov 2 '20 at 20:08
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    And being a flared connection it does not get pipe dope when you reinstall it. Nov 2 '20 at 20:11
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    @David since it seems Alaska Man's answer solved your problem, you can also click the checkmark below the voting arrow to mark the answer as accepted. Nov 2 '20 at 20:32
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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.

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