Walchem metering pumps series, EZ, EWN, EK, EHE, and EJ, E Series metering pumps are powered by advanced microprocessor-based electronics and superior mechanical design. With capacities up to 20 GPH (76 l/h) and pressures to 290 psi (20 bar), Walchem metering pumps E Series has a pump that will fit most any industrial, municipal, or agricultural water or wastewater application. And, the entire E Series pump line is backed with a comprehensive 2-year warranty that covers the entire pump, including the liquid end and diaphragm.