The Pierburg Secondary Air Injection Control Valve - 728238580 is a component used in automotive engines to control the flow of secondary air into the exhaust system. This valve helps to reduce emissions by injecting air into the exhaust stream, which helps to burn any remaining fuel and pollutants. The valve is designed to open and close as needed, based on signals from the engine's control unit. It is made by Pierburg, a reputable manufacturer of automotive components, and is designed to meet strict quality and performance standards. This product is a crucial part of the vehicle's emission control system and plays a key role in reducing harmful pollutants from the exhaust.