Turn the seacock off or you can simply turn off the valve located inside the livewell. The seacock is located in the bilge area (just lift up the bilge hatch and look for the lever valve) and the livewell valve is part of the water inflow spigot. Just remember if you leave the seacock on (open) and you have a hose failure the bilge will fill with water. I suggest leaving the seacock open only when you are actively using the livewell and/or raw water wash down.