Genuine OEM Volkswagen Coolant Pump O-Ring, part number 07Z121041A. This small but critical sealing ring is designed to prevent fluid leakage within the coolant pump assembly, maintaining the integrity of the engine's cooling system. It is positioned to seal internal components of the pump. Made from a durable, resilient elastomer, it weighs 0.0025 kg and has a diameter of 0.046 meters. Using a genuine OEM O-ring ensures the correct material and precise fitment for a reliable, long-lasting seal, vital for preventing coolant loss and ensuring efficient engine cooling.