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Personally, after seeing that I too would run a tap, make sure it's a NPT Tap and go in so more threads are sent into the pump. Just don't go crazy with the tap.And remember to put a little grease on the tap so the shavings don't go into the pump but stick to the tap.




I'd prefer taking the cover off over grease , but when tapping with a pipe tap , go maybe a turn at a time.
They open up quickly , so it isn't going to take a whole lot to sink the fitting in where you want it.