A, the guy at airgas/natl welders is a fucking idiot and/or was lying to you. B, I would take that huge fucker back for the refund and find a hobart 180 for around the same price and C, if nothing else do the thoroughbred exchange...if you do most of your welding at nights and on the weekend, it's worth the convenience. Otherwise take the tank in person to airgas and have them exchange for another for the price of a fill, they won't say a word.
