Diesel Exhaust Fluid, Container Size 55 gal, Standards API, ISO-22241-1, Container Type Drum, Color Colorless, Compatible Systems SCR Systems, Features Mixture of 32.5 Percent High Purity Synthetic Urea and 67.5 Percent Deionized Water, Classified as Minimum Risk for Transportation, Helps Convert Nitrogen Oxide to Harmless Nitrogen and Water, Non-Toxic, Stable, Flammability Nonflammable, Series Kleen DEF, Specific Gravity 1.09