This versatile Whale Non-Return Inline Valve reliably maintains prime in a suction or discharge line and does not allow drain back so a line is always ready for pumping. It fits inline and is for use with pipes of ¾ inch and 1 inch diameters. It can be used with manual or electric pumps. It is made of Nitrile® to ensure it delivers reliable long-term performance. Whale designs and manufactures reliable marine water system products which are easy to install and use; providing boaters with hot and cold water, waste management and durable bilge pumps for peace of mind.