The LEWA pump you should inquire about is model G3S/M511s/85mm which is in the LEWA Triplex Process Diaphragm pumps brochure D1-600.http://files.engineering.com/getfile.aspx?folder=da482f93-3020-4d3b-8a45-fc53c58f606c&file=D1-600LUS-process_diaphragm_07_11_screen.pdf