Genuine OEM BMW O-ring, part number 07148854462. This O-ring is a critical seal for the turbo coolant line, preventing leaks and maintaining system integrity. It is typically located at connection points within the turbocharger cooling system. The O-ring is made of rubber with specific dimensions to ensure a precise fit. Genuine OEM parts are essential for turbo coolant lines to maintain the correct sealing properties and withstand the operating temperatures and pressures.