GENUINE MEDIUM DUTY SMITH/MILLER REGULATOR SET 30-100-540 OXYGEN REGULATOR-CGA-540 CONNECTION 30-15-510 ACETYLENE REGULATOR-CGA-510 CONNECTION Up for your consideration is a set of new Genuine Smith/Miller oxygen and acetylene regulators. Included is a Smith 30-100-540 oxygen regulator with a CGA-540 connection and a Smith 30-15-510 acetylene regulator with a CGA-510 connection. These regulators are new and have never been used. I also have many other cutting and welding torches, tools and equipment listed if you are interested. Please feel free to ask any questions you may have and thanks for looking!!!