Our cartridge pumps incorporate some of the most advanced Features in the industry, Features developed from service in a wide variety of uses including racing, cruising, sport fishing and demanding commercial duties. For L450, L550, and L650, the design has been improved with easy-to-install Dura-Port discharge ports to eliminate stress cracking caused by over-tightened hose clamps. As with all submersible electrics, attention is needed during installation to ensure that wiring connections remain above water level. Specified output is US gph open flow.