On the factory installed livewell is there a seacock to allow the seawater to be turned off/on before switching the livewell pump on? Also do you put a black stopper plug in the the drain hole at the bottom during operation ? My pump volume exceeds the drain hole outflow and maintains a full livewell tank. I am familiar with other Grady livewells where I have had a drain hole /extension tube overflow pipe with a rubber fitting to screw in the drain hole. Also the drain hole is not in the center it is in a lower side so I know I am not missing the drain tube.