I think your instincts are good. Plan for the worst case senario and put some sort of a shutoff valve in any hoses going overboard. We have a sink in the head that we have to shut off when we're sailing hard because the sink goes below the waterline when we dip the port rail.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.