The Walchem EWB20Y1-VCM pump is obsolete and was replaced by the EWB21Y1-VCM pump which has a new head and diaphragm design. Both the EWB20Y1-VCM and the EWB21Y1-VCM have the same specifications of 1.8 GPH, 60 PSI, dig/ana input, PVC/CE/FKM, w/MFV, 3/8" OD, 115 VAC. Many of the liquid end parts are also interchangeable between the two generations.
