Original poster: "by way of Terry Fritz <twftesla-at-uswest-dot-net>" <Parpp807-at-aol-dot-com> In a message dated 1/30/01 12:43:51 PM Central Standard Time, tesla-at-pupman-dot-com writes: << First I have a 15/30 and I'm going to use 1/4 inch copper tubing >> 3/16 Cu tubing is more than enuff for 15/120. It is easier to bend and less costly than 1/4 or 3/8. Cheers, Ralph Zekelman