Diesel Exhaust Fluid, Container Size 2.5 gal, Standards API, ISO-22241-1, Container Type Box, 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, Injected into the Exhaust Stream with a Specialized Dosing Module, Helps Convert Nitrogen Oxide to Harmless Nitrogen and Water, Non-Toxic, Stable, Flammability Nonflammable, Series Kleen DEF, Specific Gravity 1.09