SHURFLO 4048 RV High Flow 4 GPM 55 PSI 12V Fresh Water RV PumpFresh Water Pump; Internal By Pass; 4 Gallon Per Minute SHURFLO's 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