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Re: Cutting a through-hull for bilge pump outlet
...Unrelated to your question, but be sure to use smooth bilge hose or you lose much of the pumping ability. You also lose flow rate, the higher you have to lift it to the outlet.
It sounds like you are installing a little automatic pump to take care of the stray drips, et cetera. If so, and to the extant that you can, route the hose so that it's highest point is higher than the thru-hull and as near as possible to the pump (i.e., the section of hose between the pump and the high point should be as short as possible). Then route the hose so that the water continuously flows down to the thru-hull from the high point. That way you will have the minimum amount of "back-slosh" going back into the bilge when the pump turns off. If the thru-hull is the highest point in the system the contents of the entire run of hose are likely to wind up back in the bilge at the end of each cycle.
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