Clean Ayr Top Quality DEF

Clean Ayr guarantees its customers American Petroleum Institute (API) certified diesel exhaust fluid (DEF). Our DEF is handled in accordance with the International Standards Organization (ISO) compliance regulation for DEF; ISO 22241. Clean Ayr buys and delivers the best DEF. Our DEF is tested and certified as 32.5% urea and 67.5% deionized water according to the United States National ASTM D7821-12 (21018) “Standardized Test Method for Field Test Determination of Urea Concentration in Diesel Exhaust Fluid.” We stand behind our products and give our customers the best DEF possible.