For measuring Max Mileage Fuel Catalyst. This 16 oz container is designed to squeeze 1 oz at a time into your fuel tank. It comes with a filler tube to make pouring easier. This container comes EMPTY. You will need a funnel to transfer the Catalyst from the gallon jug into this container. Please use proper safety precaution when transferring the catalyst. Avoid contact with the chemical by using gloves and transferring in an open air environment.