The Little Giant RS-5 Series diaphragm pump switches offer easy conversion from manual to automatic operation. These switches will work in clear water, grey water (effluent applications) or black water (sewage applications) such as in a sump system, sewer system or used in a pond skimmer to shut the pump off if water levels drops due to a dirty or clogged filter media. Switches can be attached to the pump itself or to the piping.