Kind of in a pickle there. Poor design for user friendly tank wrt draining all the stuff. What is that 3" bulkhead, a foam/wood filled stringer? You really need a collared fitting that the collar/flange is at the same angle as the hull so it slides thru the hole aling the line of the hull. Think about making your own custom fitting. Fiberglass tube with angled fiberglass collar all glass together.
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