The Pierburg Secondary Air Injection Pump - 728124190 is a component used in the emission control system of a vehicle. It is responsible for injecting fresh air into the exhaust system to help reduce harmful emissions. This pump is designed to work in conjunction with other emission control devices to ensure that the vehicle meets the required emission standards. The Pierburg Secondary Air Injection Pump is a high-quality, durable product that is essential for maintaining the proper functioning of the vehicle's emission control system.