> All of those pumps have stainless steel metal shafts, who impose a >problem for etching. However, those units are the kind that have been >used for spray etching. They often need replacement in a regular >basis. I do not know if someone could point out us for some kind of >magnetic drive pump that it is entirely of plastic in their conducts >with the fluid. Also, someone did comment that earlier Kepro spray >etchers had modified Little Giant pumps, I think that modifying the >metal shaft and impeller with another of plastic. I am not sure about >how to accomplish that
Take look at www.usplastics.com they list Magnetic Drive Pumps. I have never used them and prices may not be the cheapest but should give you some ideas and model # to look for.
Ben