>> >> In general, what type of ferrule is recommended with metal-to-metal >> swagelok connections--teflon or steel? >> >> ******************************** >> Steve Nelson >> > Steve- Here is another alternative that hasn't yet been mentioned: the Valco Instrument Co. (1-800-FOR-VICI) sells 1/2-inch ferrules made out of Kel-F, though they don't seem to make ss fittings of the same size. The Valco ferrules are approximately the same size and shape as Swagelock, but I will admit to never having tried a Valco ferrule in a Swagelock fitting. Alex ***************************************** Alex L. Sessions, Ph.D. Candidate Biogeochemical Laboratories Department of Geology, Indiana University 1005 E. 10th Street Bloomington, IN 47405 Phone: (812) 855-1382 FAX: (812) 855-7961 *****************************************