Norris uses O-ring seal valves, which provide the following advantages: • Smooth hand wheel operation • No packing, ensuring long maintenance free operation • Conform to all CGA requirements • Extensive tests on all valves exceed industry requirements • Other valves available upon customer request. COMMON CGA CONNECTIONS • CGA 660 (Sulfur Dioxide) • CGA 540 (Oxygen) • CGA 580 (Inert Gases ie. Nitrogen, Argon, Helium) • CGA 320 ( Carbon Dioxide) • CGA 326 ( Nitrous Oxide) • CGA 346 (Breathing Air) • CGA 350 (Flammable Gas ie. Hydrogen, Methane)