This Whale Gulper 220 Pump is durable, efficient, and powerful and it will pump gray waste, including handling shower waste such as hair and gel that can clog competitive pumps. This Gulper 220 Pump has valves that are virtually choke-free at all times, and there’s no filter to maintain and unblock. The double-outlet valve ensures continuous flow, and this 12V DC pump operates efficiently with a low power draw. It has ¾-inch hose connections, is easy to install in confined spaces, and has a multi-directional head to optimize installation versatility. It is self-priming up to 10 feet, has a 3. 5 gallons per minute flow rate, and will run dry without damage and proceed to pump a mixture of air and water. 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.