Selective Catalytic Reduction (SCR) is a technology used by diesel engine manufactures to reduce NOx emissions for cleaner air. SCR systems use Diesel Exhaust Fluid (DEF) as the catalyst to reduce NOx to near zero levels. This site is provided compliments of National Energy Equipment Inc. to assist OEM's, Dealers, Fleets, Owner/Operators, Truck Stops, Petroleum Retailers, Service Providers & Consultants with resources and technical information for handling Diesel Exhaust Fluid with reliable and effective solutions. Resources Equipment Partners Events About Us Contact Us | www. defcanada.ca | 1.866.574.5100