Quicksilver 879172T28 Marine Fuel Ethanol Alcohol Content Test Tube for Mercury & MerCruiser EnginesEthanol alcohol content test tube 879172T28 is for testing the content of ethanol in the fuel for your boat. Ethanol content in fuel can be harmful to engines and components. Easy to use to check your fuel supply and avoid the use of fuel with ethanol content.Key Product Features Used to test the percentage of alcohol in fuel for your boat; Ethanol content in fuel can be harmful to engines and components; Easy to use to check your fuel supply and avoid the use of fuel with ethanol content; Application Information:Works on all Mercury, Marine outboards and MerCruiser