A CGA fitting is the standardized system for the attachment of a compressed gas cylinder to the required regulator or transfer line. Examples of CGA fittings would be CGA-580 for Non-flamable, Non-oxidizing gasses such as Nitrogen, Argon, or Helium.
CGA-320 Nut & Nipple w/ Washer, CO2 Carbon Dioxide Fittings x 1/4" NPT CO-2
CGA-510 Nut & 3" Nipple, Regulator Inlet Fittings (Propane Acetylene)
CGA-540 Brass Nipple, for CGA 540 x 1/4 NPT Male
CGA-555 Inlet Nipples, Butane; Propane, 1-4 in (Npt), 2 1-16", Brass, Cga-555
CGA-580 Brass Nitrogen Hose Nut/Nipple
CGA N-86 FOR oxygen or Niturgen CGA G41