SHURFLO's New 4048 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. The 4048 series pump is built for high flow demand, smooth flow and no rapid cycling. SHURFLO's quality reputation has been built on the reliability and dependability of every pump we build. The 4048 series fresh water automatic demand pump is quiet, thermally protected and can run dry without damage. 4 Gallons per Minute 55 PSI, 10 Amps Max, High Performance Reduced cycling with Flow Reaction Technology™ Smooth High powered flow Runs Dry - Thermally Protected Self-Priming to 6 vertical feet Internal Bypass-Low Cycling Built-in Check Valve prevents back flow with preset switch and by-pass adjustment