Attributes . Under no circumstances should cam and groove couplings be used for compressed air or steam service! Final weld preparation, as with all weld fittings, is the responsibility of the welder; Line drawings are for reference only. Consult Anderson Process for specific dimensions. 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. . Names