I figured out a trick for removing stuck flare nuts without damaging or rounding them. I have never damaged one since using this and thought I would pass it along.

Spray a little penetrating oil on the fitting. Place the appropriate size line wrench on the fitting. Now, clamp a pair of vice grips over the end of the line wrench. Clamp it tight. This prevents the end of the line wrench from spreading open slightly which results in damage. I also found that if I hit the wrench sharply with my hand, it usually breaks lose with less chance of damage than pulling the wrench slowly.

I hope this helps somebody out. It has save my but a few times.

 

I just use the vicegrips that are made like a nut and they work most every time

evenly distributing the force

 

I try to use vice grips as a last resort because they dig into the soft metal. Try the trick I described. You'll be surprised how well it works.

 

http://www.irwin.com/irwin/consumer/...rwinProd100328

this is what IM talking about, referred to as locking wrenches

 

I saw that in a post recommended by Shoebox. I would use the vice grip if you can't get it with my trick. I have never found one I can't get off without damage using the trick I describe.