Johnson Pump Grey Water System 1000GPH 12V. While compact this Waste Water System from Johnson Pump still has the same patented technology that was initially designed for military applications. The shower sump turns on/off automatically using the Ultima switch and has multiple inlet ports for tapping waste water from more than one tapping point. The Johnson Pump 12-Volt Grey Water System also comes with a check valve on the outlet to prevent any water from flowing back into the tank. With an odor reducing tight-fitting lid compact size and high-grade materials the Johnson Pump Grey Water Handling System is sure to be the center of attention on your boat. Features of Johnson Pump Grey Water System 1000GPH 12V: 12V 1000GPH Multi-Port Grey Water System For showers dish-washing machines galley sinks etc The shower sump turns on/off automatically using Ultima switch The check valve on the outlet stops water from flowing back into the tank The shower sump turns on/off automatically using Ultima switch The check valve on the outlet stops water from flowing back into the tank Included Accessories: Grey Water System 1000GPH 12V Documentation Package Contents: Johnson Pump Grey Water System 1000GPH 12V Johnson Pump 57151: Grey Water System 1000GPH 12V