The Rein Expansion Tank - EPT0017 is a high-quality automotive component designed to regulate the pressure and volume of coolant in a vehicle's cooling system. It is made from durable materials and is compatible with a wide range of vehicle makes and models. This expansion tank helps to prevent overheating and potential damage to the engine by ensuring that the coolant is able to expand and contract as needed. It is a crucial component for maintaining the proper functioning of a vehicle's cooling system.