At Carlisle there will be a man who is a rep for a company called Duracool. (His name is Al Lambert and he had a booth at the "Spring at Carlisle" Show.) Duracool is a manufacturer of premium hydrocarbon refrigeration products. They're worth looking into for various reasons, one being that the charge necessary to fill a system is never more than 40% (by weight) of the charge of the older refrigerants which they replace. This, combined with the info Kerry Pinkerton provided recently on the list about the ease of ability of custom-made refrigerant hoses, seems to be something worth considering. Hope this information helps. Barry (the bear) 60 Crown Southampton 50 Windsor 51 NYer (various other sundries)