Attributes . Under no circumstances should cam and groove couplings be used for compressed air or steam service! Dixon stems and ferrules are specifically designed to be used together as a coupling system. Due to differences in dimensions and tolerances for safety reasons, do not use other manufacturer's stems or ferrules with Dixon products; Pressure rating recommendations are based on the use of mating Dixon fittings at ambient temperature 70?F / 21?C with a standard seal installed. For use at elevated temperature or other unusual operating conditions, consult Anderson Process. Contact Anderson Process for swage or crimp recommendations; You must purchase a fitting and the matching ferrule to create an assembly. . Names