JOHNSON 57151 12V MULTIPLE PORT SHOWER PUMP. This compact shower sump system is designed to meet the higher demands from todays boating industry where more and more equipment is used. This also includes the fresh water system onboard and involves showers, dish-washing machines, galleys sink etc. The shower sump turns on/off automatically using our Ultima switch technology and has multiple inlet ports for handling waste water from more than one tapping point. Equipped with a check valve on the outlet avoids water coming back into the tank. The tank has a tight-fitting lid to minimize splashing and odors. To further aid in cleaning, the system includes a filter mesh that removes with ease. - Intake hoses: 1 x 3/4, 1 x 3/4 or 1 x