Draper 61621 Submersible Dirty Water Pump The water pump filters out suspended solids from the dirty water making it ideal for draining out inspection pits, ditches and footings. Manufactured with a thermal overload protection device, which ensures the motor doesn t burn out and fixed with a float switch that automatically turns off the water pump when the water level has dropped below a specific set height. Fitted with approximately 10M of cable for extra flexibility of use.