When this happens, the water level inside is set too high. When the ball closures are at the top of the drink well, there is still water capacity in the trough. When the water level inside is too high and the ball is pushed, water inside is displaced and must go somewhere. Consequently, it comes out through the water seal between the top and the base. This can also happen if the fountain is not installed on a level surface or if you have a leaky valve. If your valve is leaking either replace the valve or the valve rubber. Learn more about our valves here.