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Valvoline™ Water Remover contains isopropyl alcohol and special additives designed to safely and effectively remove moisture from gasoline and diesel fuel. When added to the fuel tank, Valvoline Water Remover absorbs the water and prevents it from freezing, while also delivering a proven inhibitor that prevents rust. The encapsulated moisture is burned during combustion inside the engine. Since rust can occur in any climate or season, year round protection is crucial.