Genuine OEM Volvo Egr Radiator Tube O-Ring, part number 31338345. This O-ring is used to create a seal between the EGR radiator tube and its mating component, preventing leaks of exhaust gases and coolant. Proper sealing is essential for the efficient operation of the exhaust gas recirculation system and to maintain emissions compliance. Genuine OEM O-rings are made from materials that resist heat and exhaust gas exposure, ensuring a durable seal.