Genuine VW/Audi HVAC Heater Hose (Passat) - 5C0122058A - This is a genuine Volkswagen/Audi part, designed and engineered specifically for the Passat model. It is a high-quality, durable hose that is used to connect the HVAC system to the heater core. It is an OEM part, meaning that it is made to the same exacting standards as the original part that came with the car. It is a direct replacement for the original part and is backed by a manufacturer's warranty.