UN1954 COMPRESSED GAS,FLAMMABLE, N.O.S. (ETHYLENE, NITROGEN) 2.1 1.5 PPM METHYL MERCAPTAN (CANNOT EXCEED 1.7 PPM), 4.0 PPM HYDROGEN SULFIDE, 4.0 PPM CARBONYL SULFIDE, 24.0 PPM HYDROGEN, 551.0 PPM NITROGEN, ETHYLENE BALANCE CERTIFIED, SIZE 150AL CUSTOMER OWNED CYLINDER