The Walchem EWB15F1-FC pump is obsolete and was replaced by the EWB16F1-FC pump which has a new head and diaphragm design. Both the EWB15F1-FC and the EWB16F1-FC have the same specifications of 1.0 GPH, 105 PSI, digital input, PVDF/CE/PCTFE/PTFE, 3/8" OD, 115 VAC. Many of the liquid end parts are also interchangeable between the two generations.
