Why is it impossible to get loose? Is it new? Maybe it was sitting for long time without using it?
Cause if so maybe u need to put it in warm water and try open it first and then lubricate the orings with some pg and then work it by opening and closing it many many times before u start to use it and when u use it just be careful not to overtighten it....
How long have you had it, and when did you start having problems with it? I’m betting it’s cross threaded. Haven’t cross threaded mine…yet, but it is poorly machined, at least the threads for the top fill cap. Have to be very careful when putting it back on.
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