I have the same problem as a lot of Moomba owners with water underneath the ski locker floor. I created an access hole to vac out the water. I also put a rubber plug in the ski-locker passageway that (I thought) went back to the bilge, to keep bilge water out of the ski locker.

I just winterized the boat the other day. In dumping a couple of gallons of water from the engine block into the bilge, I thought it would stay in the bilge. It does not...it goes up under the ski locker floor again! I don't understand how it is getting there. With the ski locker hole blocked, shouldn't the water stay in the bilge underneath the engine? Inquiring minds want to know....