Genuine OEM Audi Coolant Regulator Bolt, part number WHT003868. This specialized bolt is designed to securely fasten the coolant regulator or its housing within the engine cooling system. It ensures a tight and reliable connection, preventing leaks and maintaining the proper function of the coolant flow regulation. Weighing approximately 0.0071 kg, this bolt is manufactured to precise factory specifications for thread pitch, length, and material strength. Using a genuine OEM bolt guarantees the correct torque specifications and resistance to corrosion and vibration, crucial for the long-term reliability and safety of the engine's cooling system.