Cartridge Bilge Pumps 500 GPH. For 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-Approved. Features Compact, all-in-one motor/impeller unit. No tools needed for maintenance. Extremely energy efficient. Water-cooled motor for long service intervals. Meets the international standard, ISO 8849 marine. Capacity 3 ft 0.9 m head 13.6 V 33 l/min 525 GPH. Capacity Straight 40 l/min 630 GPH. Amerpage 2.5A. Fuse Size 5 A. Connection 3/4 . Max Height 112 mm 4.4 . Weight 0.27 kg 9.6 oz. For 500 GPH, we have improved the design with easy-to-install Dura-Port discharge ports to eliminate Compact, all-in-one motor/impeller unit. No tools needed for maintenance Meets the international standard, ISO 8849 marine Capacity 3 ft 0.9 m head 13.6 V 33 l/min 52