Add some Seafoam Marine Pro Professional-Grade Fuel Treatment to your boat's fuel, and it'll do a fantastic job cleaning and protecting your boat engine's fuel system as it runs. This specially formulated gas treatment maintains maximum horsepower and overall engine performance by cleaning fuel injectors and carburetor jets. It removes fuel residues and upper engine deposits. It even lubricates upper cylinders, reduces long-term wear, and prevents the corrosion caused by ethanol and water. Seafoam Marine Pro Professional-Grade Fuel Treatment is formulated for all types of gas and ethanol fuels, and it stabilizes your tank fuel for up to 2 years. 20 oz. Cleans and protects your boat engine's fuel system. Maintains horsepower and overall performance. Cleans fuel injectors and carburetor jets. Removes fuel residues and deposits. Lubricates upper cylinders. Reduces long-term wear. Prevents corrosion. Works with all types of gas and ethanol fuels. Stabilizes fuel for up to 2 years. Dangerous goods must be shipped via ground transportation to a physical address. This item cannot ship to a PO box or Rural Route. Additional shipping fees may apply. Hazardous Material. Must ship ground only. Not eligible for expedited shipping. Contiguous 48 states only. A physical address is required for delivery.