The 3/8" hole in center was for the water inlet, which was a 3/8" tube that extended down thru a couple brackets below the hull, cut off at a 45 degree angle. The small 1/8" holes were the overflow which let water back out. It was located at water line so water could slosh in and out when at rest but circulate while you're running. Another brilliant Moesly design which created a circulating live w/o the need for a pump!
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