The Vaico Expansion Tank Retainer (E83) - V201400 is a product designed to securely hold the expansion tank in place in a vehicle. The expansion tank is an important component of a car's cooling system, responsible for storing excess coolant and maintaining proper pressure. The retainer is made of durable materials and is specifically designed for use in the E83 model of vehicles. It is an essential part for ensuring the proper functioning of the cooling system and preventing potential damage or leaks.