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Believe it or not this has worked for me many, many times. If you have a torch heat the nut up HOT it doesn't have to be red but HOT then throw cold water on it or hit it with the garden hose. It should break loose fairly easily, after that inital break you can spin the nut off almost by hand. I've used this trick on many nuts & bolts and even the 3" unions, couplings etc on the boilers @ my work. It's worked every time. Trust me you will be amazed how well this trick works.