The Pierburg Porsche Secondary Air Injection Control Valve - 700018520 is a component used in the secondary air injection system of Porsche vehicles. This valve is responsible for controlling the flow of air into the exhaust system during cold starts, helping to reduce emissions and improve engine performance. It is a high-quality, OEM (original equipment manufacturer) part designed specifically for Porsche vehicles and is made by Pierburg, a trusted brand in the automotive industry. This control valve is essential for the proper functioning of the secondary air injection system and should be regularly maintained to ensure optimal performance of the vehicle.