Genuine OEM Porsche Engine Coolant Tube O-Ring, part number 99970758640. This O-ring is designed to seal the connection of the engine coolant tube, preventing coolant leaks and ensuring the efficient operation of the cooling system. It has dimensions of 50mm outer diameter, 50mm inner diameter, and 4mm thickness. Genuine OEM parts are manufactured to withstand the temperatures and pressures within the cooling system, ensuring a durable and leak-free seal.