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PrimeGuard Ultrapure DEF improves fuel economy and reduces nitrogen oxide concentrations (pollutants) to ensure optimumperformance of the SCR (Selective Catalytic Reduction) system. Made from high purity urea and deionized water. Meets EPA (Environmental Protection Agency) 2010 regulations. API (American Petroleum Institute) certified to meet the stringentAUS32, DIN70070 and ISO 22241 standards for purity and concentration. Flexible dispensing nozzle designed to fit dieselexhaust fluid vehicle fill port. Single use.