Genuine OEM Volkswagen Heater Coolant Hose, part number 7P0819308. This hose is an integral part of the heating system, responsible for circulating hot coolant to the heater core to provide cabin warmth. It incorporates a small cylindrical component, likely a restrictor or filter, within its assembly. Weighing 0.031 kg, this genuine OEM hose ensures proper coolant flow and temperature regulation, critical for effective heating and preventing leaks.