Autostar Germany EXPANSION TANK CAP For Audi 3B0121321

Replacement Numbers: 3B0121321, 95810644700

Description:  The Autostar Germany Expansion Tank Cap 3B0121321 is designed to maintain correct pressure within the cooling system of Audi vehicles. Built to OEM specifications, this cap ensures a secure seal that helps prevent coolant loss, overheating, and pressure imbalance. Manufactured from durable, heat-resistant materials, it delivers reliable performance under high engine temperatures and daily driving conditions. Proper pressure regulation supports efficient engine cooling and protects vital components such as the radiator and hoses. Ideal for replacement or routine maintenance, this expansion tank cap helps keep your Audi’s cooling system operating safely and efficiently.