Ah.... I left out one pump criterion: Static pressure of liquid being pumped is 40-80psi above atmosphere (ie: the reservoir is under city water pressure). Note that the pump is recirculating through the reservoir, so it only sees a small head. Bob Ammerman -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist