Genuine OEM Jaguar Thermostat O-Ring Gasket, part number AJ83525. This O-ring provides a vital seal for the thermostat, preventing coolant leaks and ensuring the cooling system operates efficiently. It is designed to withstand the thermal and chemical stresses within the engine's cooling circuit. Weighing just 0.01 kg, this small but crucial component is made from a durable elastomer. Using a genuine OEM gasket ensures the correct material composition and precise dimensions for a reliable, long-lasting seal, preventing costly coolant system failures.