I rarely use it, but I can't seem to keep my XB-21's live well dry. Over the course of the day, 1 to 3 inches of water will appear. It happens even with the valve in the recirculate position and a plug installed in the drain hole. There is zero water in the bilge after a day's fishing. There is no sign of the water leaking into the bilge or out of the drain once the boat is back home, ie the plug and valve setting is watertight. The only explanation I can come up with is the water is coming in the overflow when encountering a wake. Anyone else having this issue? Is there a check valve in the drain line that has gone bad or is a trip to Lowes for a rubber stopper in my future?