37 fuel tank

[Derby]

The fuel tank outlet tube on my '37 is damaged and needs to be replaced. The retaining nut fitting has been rounded off and will not accept a wrench. Prior to my attempts to loosen the fitting, I am asking for help in understanding the connection. The tube must extend about three inches through the fitting into the tank. Is the fitting soldered in place or is it removable? I want to avoid more damage in the attempt to remove the fitting.