Johnson Pump 500 GPH Bilge Pump 3/4" Hose 12V Dura PortsCartridge Bilge Pumps 500 GPHFor 500 GPH, we have improved the design with easy to install Dura Port discharge ports to eliminate stress cracking caused by over tightened hose clamps. The pumps are delivered including both a straight and a 90 degree smooth elbow Dura Port as well as a removable check valve. Both the Cartridge and the Ultima Combo pumps may be manually operated via the Johnson Pump bilge control panel. CE ApprovedFeatures: Compact, all