i dont know if your boat is staying on a trailer when not in use but instead of raising the deck, you can build a sump like another member did for his deck drains. i dont remember the name or id link to it. but there was a sump with a 1500 or 2000 gph pump that both of the deck drains into and then gets pumped over. then you dont have to raise the deck and you only have 1 thru hull. when its on the trailer in your yard put a drain plug in the sump and pull the plug so rainwater goes into the bilge and out of the main bilge drain. if its in the water all the time then this idea might not be for you.
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