This simple, yet effective controller provides the means of controlling an automatic pump, used to transfer stormwater from a collection pit to a storage tank. This system has low voltage supply to the float switch, situated in the storage tank, and the controller. When the storage tank is full, the controller isolates the pump and the 'tank full' light is illuminated. An IP68 connector is provided for a waterproof connection for the float switch cable at the storage tank.