I agree with both the above, once you start to round it you might not even be able to get a line wrench on it anymore.
I prefer PB Blaster to WD.
You can also try some heat, but be careful... if you resort to ViceGrips you have already destroyed it and the line should be replaced. DO NOT get one of those line splicing kits with the union... it WILL fail.
If it's shot already then use whatever means to get it out and replace the entire line.
JT
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