Genuine OEM Mercedes-Benz AdBlue Injection Nozzle, part number A0004900713. This nozzle is a critical component of the selective catalytic reduction (SCR) system, responsible for injecting AdBlue fluid into the exhaust gases to reduce harmful nitrogen oxide (NOx) emissions. It is typically located in the exhaust system. Genuine OEM AdBlue injection nozzles are manufactured to exact specifications for precise fluid delivery and optimal emissions control.