Genuine OEM Mercedes-Benz AdBlue Injection Nozzle, part number A0004905100. This nozzle is a critical component of the Selective Catalytic Reduction (SCR) system, responsible for precisely injecting AdBlue fluid into the exhaust stream to reduce harmful nitrogen oxide (NOx) emissions. Genuine OEM nozzles ensure accurate spray patterns and proper fluid delivery for effective emissions control. Its function is vital for meeting environmental regulations.