The Walchem EWB20F1-VC pump is obsolete and was replaced by the EWB21F1-VC pump which has a new head and diaphragm design. Both the EWB20F1-VC and the EWB21F1-VC have the same specifications of 1.8 GPH, 60 PSI, digital input, PVC/CE/FKM, 3/8" OD, 115 VAC. Many of the liquid end parts are also interchangeable between the two generations.
