Johnson cartridge bilge 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 we have improved the design with easy to install Dura-port discharge ports to eliminate stress cracking by over tightened hose clamps. The pumps are delivered including both a straight and a 90° smooth elbow Dura-Port as well as a removable check valve. 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 8349 marine 70mm base x 112mm high