The shower sump turns on/off automatically using our Ultima switch technology and has multiple inlet ports for handling waste water from more than on tapping point. The check valve on the outlet stops water from flowing back into the tank. Tank has a tight-fitting lid to minimize splashing and odors. Capacity 1.0 m head: 844 GPH. Capacity straight: 972 GPH. Discharge connection: 3/4″. Dimensions: 8.26″ W x 11.42″ L. 12 volt.