Genuine OEM Volkswagen A/C Expansion Valve Orifice Tube, part number 4B0820177. This small but critical component meters the flow of refrigerant into the evaporator, facilitating the cooling process within the air conditioning system. It is an integral part of the HVAC system. Weighing only 0.003 kg, a genuine OEM orifice tube ensures precise refrigerant control and optimal system efficiency, maintaining consistent cabin cooling and preventing damage to other A/C components.