The Genuine BMW Heater Core Return Hose - 64216951946 is a high-quality replacement part for BMW vehicles. It is designed to be used with the heater core, which is responsible for providing warm air to the interior of the car. This hose is specifically designed to return coolant from the heater core back to the engine, ensuring proper circulation and heating. It is made from durable materials to withstand high temperatures and resist wear and tear. This hose is an authentic BMW part and is guaranteed to fit and function properly. It is an essential component for maintaining the heating system in your BMW and ensuring a comfortable driving experience.