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VA, I just removed mine to reinforce my transom for the jack plate. Yours as a gift but useless for my needs. Dang thing is 12" below water line. Probably drains the transom on plane but water came in when trolling. I say plug the tube or remove tube and fill in completely. I have a bilge set up there. Contact me on email address and I will send it out.

Garris

Edit: The back of the boat drains over the transom once you fire up the boat with some speed. Actually a pretty cool feature. That is why I am installing a removable splash board. Our boats are "self draining". My bilge could not keep up with the water coming over the transom. Did not bother me but bothered guests. Happened during drift fishing and reverse was a total nightmare.