The following charts are posted to assist in matching CGA valves and fittings with their corresponding gases. This is a reference tool only. Please consult a qualified gas supplier or the CGA to determine the actual valve types and CGA connections required for your application.


CGA Fittings Pure Gases
510/300 Acetylene
590/346/347/702 Air
240/660/705 Ammonia
580/680/677 Argon
350 Arsine
320 Carbon Dioxide
350 Carbon Monoxide
660 Chlorine
510 Cyclopropane
350 Deuterium
350 Ethane
350 Ethylene
510 Ethylene Oxide
580/680/677 Helium
350/695/703 Hydrogen
330 Hydrogen Chloride
330 Hydrogen Sulfide
580 Krypton, KR-85
350/695/703 Methane
510 Methyl Chloride
580/680/677 Neon
580/680/677 Nitrogen
326 Nitrous Oxide
540/577/701 Oxygen
350 Phosphine
510 Propane
350 Silane
668/660 Sulfur Dioxide
590 Sulfur Hexaflouride
580/680/677 Xenon


CGA Fittings Gas Type
870 Oxygen
940 CO2
930 Inert / Nitrogen
960 Inert / Nitrogen
910 Nitrous Oxide
950 Breathing Air
965 Medical Gas Mixtures
973 Medical Gas Mixtures


CGA Fittings Minor Component Major Component
240/660/705 Ammonia Nitrogen
350 Butane Nitrogen
296 Carbon Dioxide Oxygen
580 Carbon Dioxide Helium or Nitrogen
580 Carbon Dioxide Helium and/or Nitrogen
330 Chlorine Nitrogen
350 Diborane Argon Helium Hydrogen or Nitrogen
580 Freon-12 Nitrogen
296 Helium Oxygen
350 Hexane Nitrogen
350 Isobutane Nitrogen
350 Krypton-85 Carbon Monoxide Hydrogen or Methane
330 Krypton-85 Chlorine
540 Krypton-85 Oxygen
580 Moisture Argon Helium or Nitrogen
660 Nitric Oxide Nitrogen
660 Nitrogen Dioxide Air or Nitrogen
590 Nitrous Oxide Nitrogen
590 Oxygen Nitrogen or Helium
350 Propane* Nitrogen or Helium
660 Sulfur Dioxide Air or Nitrogen
590 Sulfur Hexaflouride Argon Helium or Nitrogen
350 Sulfur Hexaflouride Hydrogen
350 Tritium Argon Carbon Dioxide Hydrogen Methane Neon Nitrogen Krypton orXenon

It is the user’s responsibility to familiarize him/herself with the specific properties and dangers of the gases used for their application. The valve outlet to be used with a cylinder for a particular use is specified by the Compressed Gas Association (CGA). CGA specifications can be found in the document published by the CGA entitled “CGA STANDARD V-1, Compressed Gas Cylinder Valve Outlet Connections.” These specifications have been adopted to prevent the inadvertent mixing and/or improper use of gases that could be dangerous. The chart described here is a reference tool only. Consult your gas supplier or the CGA to determine the actual valve type and CGA connection required for your application. Compressed gas cylinders, valves, and the gases contained in them are dangerous and should only be handled by qualified individuals.