If the livewell is over your bilge I would drill a 1/2 inch hole in the bottom and use an expandable 1/2 inch rubber plug when using the livewell. then pull the plug when away from the boat. If not over the bilge, then see if you could tie a drainline into the macerator discharge line and plug the drain when the livewell is in use. Or, you could consider drilling a 1/2 inch hole in the bottom side of livewell and plugging it with an expandable plug from the inside. the water would then run out on the deck with the plug out. Good luck!
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