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It would be pretty tough to pressure test a tank in a boat as among other issues you don't have easy access to all sides to check for leaks when doing so. My custom stainless tank was tested with 5 psi on the bench when made and checked with both soap and an ultrasonic tester which takes any small leak and amplifies it to headphones. A leak you can't hear with the naked ear becomes real obvious this way. By the way my tank does have a drain valve built-in with both a ball valve and a plug in the end for the future draining of it if ever necessary. I watched it being made and tested as the welder is a friend.
Brian
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