The Rein Expansion Tank Kit - 471782 is a comprehensive set of products designed to service a car's expansion tank. This kit includes various components such as hoses, clamps, and seals, as well as a new expansion tank itself. The kit also includes a radiator cap and a coolant level sensor. These products are essential for maintaining proper coolant levels and preventing overheating in a car's engine. With this kit, car owners can easily replace worn or damaged parts in their expansion tank system and ensure optimal performance of their vehicle.