Berryman 1112 B-12 Chemtool Injector Cleaner Fuel Treatment, 12 oz. Pour-In Long-Neck Bottle Contains detergents and high-energy solvent technology One tank clean-up of fuel injectors, fuel pump, and fuel lines Quickly dissolves gum, varnish, and other fuel residues Disperses moisture in conventional gasoline Catalytic converter and O2-sensor safe