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Prestone Products Corporation’s line of Prestone Command Diesel Exhaust Fluid (DEF) is a liquid reducing agent that has been developed for use in all diesel engines that are equipped with a Selective Catalytic Reduction (SCR) system. Prestone Command DEF is a colorless, odorless, non-toxic and non-flammable liquid solution consisting of 67.5% demineralized water and 32.5% high-quality automotive-grade urea. It meets all API and ISO 2224-1 manufacturing specifications. DEF will corrode certain metals, such as aluminum, copper and brass, so it must be used and stored with dispensing equipment and tanks that are made of stainless steel or high-density polypropylene. Prestone Command™ DEF is available in 1- and 2.5-gallon (3.78- and 9.45-liter) containers, as well as 55-gallon (208.2 liter) drums and 330-gallon (1,249.19 liter) totes.