Peak 2.5-Gallon Blue Def Diesel Exhaust Fluid. It is a stable, colorless, non-flammable, non-toxic mixture of 32.5% high purity synthetic urea and 67.5% deionized water. It is used in selective catalytic reduction systems on diesel engines to convert NOx to harmless nitrogen and water. Def is classified as minimum risk for transportation and conforms to the ISO-22241-1 specification for def. It is API registered and meets or exceeds OEM specifications.

• 2.5 Gallon
• Blue color
• Stable, colorless, non-flammable, non-toxic mixture of 32.5% high purity synthetic urea and 67.5% deionized water
• Used in selective catalytic reduction systems on diesel engines
• Converts NOx to harmless nitrogen and water
• Classified as minimum risk for transportation
• Conforms to the ISO-22241-1 specification for def
• API registered and meets or exceeds OEM specifications