...I Agree with Bdud!!
It's called a 'Flare-Nut Wrench'.
If you don't have one, don't even Attempt trying to loosen the Nut! You WILL round it off, Guaranteed!! with a 'Open-End Wrench'.
And Vise-Grips DON"T work!
But, you'll have to Replace the Metal Line Anyway!
You'll need a 7/16" or 1/2" size.
If you do not have one, Go Buy One!
And Soak the Nut in a little WD-40...just My 2 Cents.
...I also agree with ZR1, My Money's bet on the Rubber Hose Being the Problem! You'll still need a Flare-Nut Wrench!
Having the Correct tool, gets the Job done Right, the First Time! And it Makes the Job go EZ.
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