Cartridge Bilge Pumps. For 500 GPH, 750 GPH, and 1000 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.. Features:. Capacity 3 ft (0.9 m) head (13.6 V): 44 l/min - 700 GPH. Capacity Straight: 50 l/min - 800 GPH. Amperage: 3 A. Fuse Size: 5 A. Connection: 3/4". Max Height: 112 mm - 4.4". Weight: 0.27 kg - 9.6 oz.