The Pierburg Air Pump - 721852780 is an automotive component used for the secondary air injection system. It is responsible for delivering fresh air into the exhaust system to reduce harmful emissions. This air pump is designed by Pierburg, a German automotive supplier known for its high-quality products. The 721852780 model is compatible with various car models and is made with durable materials for long-lasting performance. It is an essential part of the secondary air injection system, which helps vehicles meet emission standards and improve engine efficiency.