Diesel Exhaust Fluid (DEF) is a urea-based fluid designed to reduce NOx emissions. Because of increasingly stringent vehicle emissions standards, most new diesel vehicles require a DEF system to remain compliant. When servicing your DEF system, it’s critical to use the correct pumping and handling equipment, otherwise you risk expensive catalyst or DEF injector failures. And because DEF contains urea, which can form crystals that creep through joints and seals of poorly-designed equipment, precise engineering is required when designing DEF pumps. CARDONE direct-fit, plug-and-play DEF pumps are a reliable and complete solution to a worn or malfunctioning factory unit.