800 GPH Hose Size 3/4″ and 1″ ID. The only automatic bilge pump that eliminates airlocks. Patented X-Air impeller ejects trapped air in the pump and pipework. External mounting feet and integrated outlet reduce time and effort. Universal mounting pattern makes replacement simple. Service pump cartridge from hard-to-reach areas using only one hand. Attwood’s SteadySwitch reduces cycling and extends the life of the pump. 40% better protection against water ingress and electrolysis – vs. Mk1. 2X better protection against water ingress and electrolysis than the leading competition. Flexible outlets: 90� rotatable elbow outlet allows users to install the pump anywhere in a full 360� orientation. Includes check valve. 12 volt.