Keeping you Ready for the Road Ahead , this Dorman Hydrocarbon Injector Nozzle successfully restores the vehicle’s emission system’s critical dosing function into the exhaust stream during the regeneration cycle. Therefore, the Dorman fuel nozzle successfully removes excess carbon build up from the diesel particulate filter (DPF). This heavy duty hydrocarbon injector nozzle is an ideal replacement for worn or compromised original equipment. Failure to replace the air dryer during regular maintenance intervals, can lead to failure of the regulator, module, and the air dryer. Replacing all three parts together minimizes premature faults in the hydrocarbon dosing system. FleetPride is your First Click in Heavy Duty .