The Pierburg Secondary Air Pump (part number 721852860) is an essential component of a vehicle's emissions control system. It is responsible for injecting fresh air into the exhaust system to help reduce harmful emissions. This pump is designed to be durable and reliable, providing efficient operation for extended periods of time. It is a direct replacement for the original equipment and is compatible with a wide range of vehicle makes and models. The Pierburg Secondary Air Pump is a crucial part of maintaining a vehicle's emissions compliance and ensuring optimal engine performance.