The Shurflo Revolution fresh water pump boasts a unique one-piece diaphragm and internal by-pass, ensuring unparalleled durability and reliability across all plumbing systems. Crafted to exceed customer expectations, this legendary pump offers high flow demand, low noise, and no rapid cycling. Operating quietly, thermally protected, and capable of running dry without damage, the 4008 Revolution pump provides peace of mind in your RV. Its versatility includes the ability to mount in any position, self-prime, and prevent backflow with a built-in check valve. With a pressure range of 45 to 55 PSI, this pump guarantees optimal water delivery. Note that the E65 and A65 are identical pumps, and the listed pump does not come in retail packaging, possibly containing a small amount of water from factory testing. Featuring 1/2" fittings, it combines quality, durability, and convenience for your plumbing needs.