Genuine OEM Volkswagen Coolant Hose, part number 3QF121109B. This hose is part of the engine cooling system, connecting various components to circulate coolant. It is located in the engine bay, connecting to the thermostat housing and other coolant lines. Made from durable rubber and metal for long-lasting performance. Genuine OEM ensures exact fit and material integrity, crucial for preventing leaks and maintaining optimal engine temperature.