Interesting idea...or one could leave the thru-hull valve alone and just install a T between the valve and the pump with your capped hose attached. That way there's never any mistake involving turning the three way valve to the wrong position and you have a valve that you can close and your antifreeze hose ready to go as well.
1983 Fraser 41
La Conner, WA
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Boating for over 25 years, some of them successfully.