Genuine OEM Audi Coolant Regulator Housing, part number 022121117C. This component is designed to house the engine's thermostat, regulating the flow of coolant to maintain optimal operating temperatures. Constructed from durable plastic and weighing 0.36 kg, it ensures a secure and leak-free connection within the cooling system. Choosing a genuine OEM housing guarantees proper fitment and reliable coolant management, preventing overheating and engine damage.