I had that problem. We used a socket ground down on the end so it would get a better bite on it. Then a long breaker bar and a pipe. I took it back to the dealer because it was so hard, he called them and they said if it broke they would replace the tank. I pushed in while he turned it also. There was no corrosion, so I think the paint or finish was wet when it was put in and dried like glue.
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