A Rule 500 GPH Bilge Pump was installed in the bottom of the water ballast tank through a deck plate placed under the dech step.

See Closer Look at the Pump and Deck Plate

Note that there should be a blue screen that attaches to the botton of the bigle pump. I premanently mounted the screen (3M 5200) to the botton of the W/B tank. Now I just pass the pump through the deck plate and snap it into the screen on the bottom of the tank. After the tank is pumped, I just unsnap the pump and store in a dry place for the next time. Ill just leave the plastic tubes in the tank so they are out of the way.

See Inside the W/B Tank with the Pump Snapped in Place

See Picture of the Pumps Screen Glued to Tank Bottom

It is this screen into which the pump is snapped into place or removed.

See W/B Tank is just emptied into the cockpit