PETROLEUM GAS, LIQUEFIED (N-BUTANE, ISOBUTANE) 2.1 0.35% PROPANE, 19.80% ISOBUTANE, 11.90% ISOPENTANE, 10.45% N-PENTANE, 15.55% HEXANES PLUS, N-BUTANE BALANCE CERTIFIED, 1000CC PISTON CUSTOMER OWNED CYLINDER