SHURflo's New 4009 Series 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 customers, the 4009 series 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 they build. The 4009 series fresh water pump automatic demand pump is super quiet, thermally protected and can run dry without damage. Pump Filter 001611 must be used.