I was wondering if most livewell setups have some sort of shutoff? My Hydra-Sport has the aerators and has an open drain at the bottom. When the boat is in the water the live wells will take in a little water and can be filled with the aerator. When I take off though the live wells will just drain out back into the lake. Are you supposed to plug the bottom drain with something or am I missing some sort of shut off for the drain? It doesn't look like anything was ever tampered with so I assume it came setup like this.