the easiest would be to put an intake shutoff inside the well for easy access that would come from high speed clam shell. I never had one set up like this , I always pumped in and the drain was out the transom, it would overflow some if everybody went to the back but I'm in Fla. I like the idea of pumping out as the pump pumped the water out it would seek its own level and draw freshwater from outside at the same rate.
the above floor well under a leaning post is the best setup but is a good deal more money to set up
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Any way you measure it - dumbass is expensive
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