The Pierburg Secondary Air Injection Pump - 728124300 is a component used in automotive engines to reduce emissions. It works by injecting fresh air into the exhaust system, which helps to burn off any remaining fuel and pollutants. This pump is responsible for supplying the necessary air pressure to the secondary air injection system. It is a high-quality and durable pump that is designed to meet strict emissions standards. This product is compatible with various vehicle makes and models and is an essential part of the emissions control system.