On Sep 3, 2012, at 5:07 PM, relng...@aol.com wrote:

> What is DEF?


Diesel Exhaust Fluid. 

For Selective Catalytic Reduction systems in modern diesel tractors (semis) and 
other diesel using equipment. 

http://www.cumminsfiltration.com/html/en/products/fuel/diesel_emission/urea.html

http://www.air1def.com/en/



Rick
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