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Diesel Exhaust Fluid (DEF) MANSFIELD ENERGY RELIABLE SUPPLY With the most extensive North American DEF supply network, Mansfield ensures DEF supply allocations at every primary supply point in North America. Mansfield offers Yara’s Air1 brand in
SCR uses a chemical called Diesel Exhaust Fluid (DEF / Urea) and a SCR catalytic converter to significantly reduce nitrogen oxide (NOx) emissions in diesel engines. SCR has been selected by all but one major engine manufacturer (International being the exception) as their method to meet the 2010 specification.