Sea Foam 20 oz. Marine Pro. Add to fuel system to clean fuel injectors and carburetor jets, ensuring smooth engine operation. It cleans and lubricates critical upper engine areas, reducing long-term engine wear. This product helps prevent corrosion caused by ethanol and water, keeping your engine in top condition. It also stabilizes tank fuel for up to 2 years, making it ideal for seasonal use. Safe for all 2 and 4 stroke gasoline marine engines, inboard and outboard.