SHURFLO®'s Revolution™ fresh water pump design was created with a unique one-piece diaphragm and internal by-pass, assuring long life and top performance in all plumbing systems. Designed as the next legendary pump to exceed the expectations of our customers, the Revolution™ Pump is constructed for high flow demand, low noise and no rapid cycling. Shurflo®'s quality reputation has been built on the reliability and dependability of every pump we build. The 4008 Revolution™ fresh water automatic demand pump is super quiet, thermally protected and can run dry without damage. Mounts in any position. Self-PrimingInternal Bypass-Low CyclingRuns Dry - Thermally ProtectedBuilt-in Check Valve