Bronze threaded fittings are manufactured from smooth-cored castings, designed to provide full flow with minimum restriction. All threads are accurately machined and gauged to ensure a perfect fit with the pipe. All fittings are individually tested under water to ensure quality.
NPT (tapered) threads should be sealed with PTFE plumbing tape or equivalent.
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it worked well
I also plugged the thru hull with underwater epoxy to be safe but this cap made that job easy