Johnson Pump 1000 GPH Multi Port Shower Sump Pump 12V w/Switch [57151]1000 GPH Multi Port Shower Sump Pump 12V with Switch This compact shower sump system is designed to meet the higher demands of today's boating industry where more equipment is used. This also includes the freshwater system onboard and involves showers, dish washing machines, galley sinks, etc. The shower sump turns on off automatically using our Ultima switch technology and has multiple inlet ports for handling wastewater from more than one tapping