Small 12volt lawnmower battery, that plugs and plays to run the aerator. The raw water wash down fills the well. The aerator oxygenates the water. When water is added, the extra runs out the overflow, and into the cockpit drain.r
Another angle. The ribs step up in height, to allow for the sloping floor. It makes for a flat floor in the Head. Three screws hold each outside piece to the center. The two wings are removed, and then the center is lifted out.