Genuine OEM Hyundai Thermostat Gasket, part number 256332G000. This essential rubber O-ring creates a watertight seal for the thermostat housing or water inlet fitting, preventing coolant leaks in the engine cooling system. It is designed to withstand temperature fluctuations and chemical exposure from engine coolant. Using a genuine OEM gasket ensures precise dimensions, correct material composition, and reliable sealing performance to maintain the integrity of the cooling system.