Genuine OEM Volkswagen Refrigerant Hose, part number 1K1820741B. This hose is designed to transport refrigerant between various components of the air conditioning system, such as the compressor, condenser, and evaporator. It is located within the A/C system assembly. The specific material and construction of genuine OEM hoses ensure they can withstand the high pressures and temperatures of the refrigerant cycle, preventing leaks and maintaining system efficiency.