This product is a genuine engine auxiliary water pump designed for use in Volkswagen and Audi vehicles. The part number is 5Q0121599AN. It is a vital component of the engine cooling system, responsible for circulating coolant to keep the engine at a safe operating temperature. This pump is manufactured by the original equipment manufacturer and is designed to meet the same specifications as the original part installed in the vehicle. It is a high-quality and reliable replacement for a worn or malfunctioning water pump.