The Dorman 306-018 Secondary Air Injection Pump is designed for Mercedes-Benz models and is a crucial component for emissions control. This pump, with OEM part number 0001405185, does not include a pulley or mounting hardware. It is a reliable aftermarket option manufactured by Dorman, a reputable brand in the automotive industry. This product is essential for ensuring proper secondary air injection in Mercedes-Benz vehicles, contributing to their overall performance and compliance with emission regulations.