Drew, I did this once and used a through hull fittings attached to the cooler. two small bilge pumps to help fill and recirculate the water, a piece of ply wood epoxied to the side of the cooler for the toggle switches and pumps mountings to make it all work. I had to hang the flexable hose over the side to pump the water in and out so the process was all manual, but served its purpose. It was located in rear department of the boat so the wiring was not hard and the hoses did not pose too much of a problem.