The Rein Expansion Tank - EPT0125 is a high-quality automotive part designed to regulate the pressure and volume of coolant in a vehicle's cooling system. This tank is made from durable materials and features a built-in diaphragm that allows for expansion and contraction of the coolant as it heats and cools. It also has a built-in pressure relief valve to prevent damage to the cooling system. This product is compatible with a wide range of vehicle makes and models and is an essential component for maintaining optimal engine performance and preventing overheating.