The Jabsco macerator pumps are the answer to holding tank pump outs. The macerator section grinds waste into small particles so it easily passes through the pump's hose discharge port. Detects the absence of fluid then shuts-off pump before impeller is damaged. Sensor provides a 16 - 20 second run-dry period to allow initial priming of pump. Interrupting power supply to the macerator resets the Run-Dry Device. Flow rate to 12 gpm (451pm). Self-priming to 4ft. (1.2m) vertical lift. Complies with USCG 183.410 and ISO 8846 MARINE (Ignition Protection).