SHURflo 4048 High Flow Multi-fixture Automatic Demand Pump. From the by-pass Flow Reaction Technology Series, this pump has a unique one-piece diaphragm and internal by-pass to assure smooth flow, long life and top performance in any plumbing system. Designed and built for high flow, low noise, smooth flow with no rapid cycling and SHURflo reliability, this fresh water demand pump is quiet and can run dry without damage. Mounts in any position. This pump is designed to replace both the 4900 and 5900 Smart Sensor series products. Features smooth flow reduced cycling 4 gpm and 55 psi high performance automatic thermal overload protection runs dry without damage built-in check valve 2 year mfr. warranty.