Genuine OEM Volkswagen Coolant Regulator Housing Lid, part number 057121484C. This lid is designed to cover and seal the coolant regulator housing, preventing leaks and ensuring the integrity of the engine cooling system. It is typically located on the right side of the engine. Constructed from durable metal with an integrated rubber gasket, it weighs 0.09 kg. Using a genuine OEM lid ensures a precise fit and a reliable, leak-free seal, critical for maintaining proper engine operating temperatures.