Berryman Products 0116 B-12 Chemtool Carburetor, Fuel System and Injector Cleaner, 15 Ounce, (Single Unit) Contains 100% High-Energy Solvent Technology Helps Keep Injectors Or Carb(S) And Intake Ports And Valves Clean Quickly Disperses Moisture And Dissolves Gum, Varnish, And Other Fuel Residues Disperses Moisture In Conventional Gasoline Quickly disperses moisture and dissolves gum, varnish, and other fuel residues Use on the entire fuel system, fuel tank, fuel lines, fuel injectors, valves, rings and pistons with H.E.S.T. Ensures higher compression, fewer repairs, lower operating costs and increased spark plug and injector life Catalytic converter and oxygen sensor-safe