Genuine OEM Volkswagen Coolant Hose With Coupling, part number 5WA121049S. This complex hose assembly is a critical part of the engine cooling system, responsible for routing coolant between various components such as the radiator, engine block, and other heat exchangers. It is typically positioned on the left side of the engine bay and features integrated couplings for secure connections. Weighing approximately 1.138 kg, this hose is designed for high-temperature and pressure environments. Using a genuine OEM coolant hose ensures precise fitment, correct material composition for durability, and reliable, leak-proof connections essential for maintaining optimal engine operating temperatures.