From the factory it only had a drain at the bottom... the other two "ports" were added by a previous owner but the way they would work is that the bottom one would be fed by a live well pump with lake/sea water and the upper one would be over flow... the problem with this is that the drain would be right about the same level as the water outside the boat and wouldn't work well... sooooo turning on the pump would most likely cause the well to over flow.....
Best bet is to plug the extra holes
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