Uniweld F36 Adaptor CO2 Cylinder to Nitrogen Regulator Durable brass construction that is corrosion resistant CO2 Cylinder (CGA320) to Nitrogen Regulator (CGA580) Adaptor CGA is the Compressed Gas Association CGA320 is the Cylinder Valve Connection for Carbon Dioxide CGA580 is the Cylinder Valve Connection for Nitrogen, Argon and Helium