This Whale Mk5 Universal Pump is a tested, proven, and highly popular manual bilge pump, delivering long-term durability and reliability and smooth, efficient pumping. It is designed for use on a boat 40 feet long or longer. This pump has a multi-mount design, providing great versatility about where and in what position it is mounted. It can be mounted on-deck, through-deck, or on-bulkhead. This pump features rugged and lightweight polypropylene construction, a sturdy metal pump lever, and an easy-grip handle. It features non-choke valves for consistently sure pumping. It uses 1 ½-inch hose connections and a 17.5 GPM max flow rate is possible (based on 70 strokes per minute). Whale designs and manufactures reliable marine water systems which are easy to install and use; providing boating enthusiasts with water, waste management and durable bilge pumps. For over 70 years, Whale has delivered innovative, high quality products that ensure peace of mind and allow you to enjoy your adventures on the water.