I'd be interested in how to solve leaky tank fittings.. Mine has been tightened too far I think, When I tightened it, it 'slipped' one thread. It certainly doesn't feel tight though, and seeps a little water on occasion.
It's plastic fitting in plastic thread on tank, so not brill.
I've tried using loads of PTFE tape, but perhaps not enough?
I was wondering if anyone has tried gluing the fitting in place? Any disadvantages to doing so?