The A/C hose is a hose used in air conditioning systems in vehicles. The abbreviation "A/C" stands for "Air Conditioning". Air conditioning systems in vehicles are used to cool and dehumidify the indoor air. In this system, refrigerant (usually R134a or R1234yf) is used to remove heat from the air and produce cool air inside the vehicle. The A/C hose circulates this refrigerant and enables efficient operation of the air conditioning system. These hoses are flexible tube-like parts made of elastomeric materials and are designed to withstand the pressure of the refrigerant.