- From cylinder service: CGA-200 "MC" acetylene - To regulator service: CGA-510 "POL" acetylene - Prostar adaptors safely connect a regulator to a cylinder or other equipment when different CGA threads on the mating parts make a direct connection impossible - Select an adaptor carefully to ensure that regulators and other equipment are used only with compatible gases and pressure ratings - A mixture of non-compatible gases in any system is a possible hazard - Regulators and all other parts of an adapted system must be thoroughly purged of all contaminants, especially organic material and residual gases - Replace worn or damaged fittings immediately to ensure safe and dependable operation