The Reinz Secondary Air Injection Pipe O-Ring - 407651800 is a small, circular rubber seal designed to fit onto the secondary air injection pipe. This pipe is a component of a vehicle's emissions control system, which helps to reduce harmful pollutants from the exhaust gases. The O-ring is responsible for creating a tight seal between the pipe and the surrounding components, ensuring that the system functions properly and efficiently. It is a high-quality replacement part made by Reinz, a trusted brand in the automotive industry. This O-ring is compatible with various vehicle models and is an essential component for maintaining the proper functioning of the emissions control system.