PETROLEUM GAS, LIQUEFIED (N-BUTANE, ISOBUTANE) 2.1 0.400% METHANE, 0.200% CARBON DIOXIDE, 0.400% ETHANE, 0.650% PROPANE, 22.100% ISOBUTANE, 12.500% ISOPENTANE, 10.000%, N-PENTANE, 16.250% HEXANES+, 37.500% N-BUTANE, CERTIFIED, 1000CC PISTON CYL, CUSTOMER OWNED, LIQUID PHASE