Caps play an important role in vehicle air conditioning systems, as they are used on charging and service ports to prevent refrigerant leakage and protect against contamination of the ports. These small but critical components ensure that the system remains sealed when service or maintenance is not being carried out. The caps are usually made of durable, corrosion-resistant materials to withstand harsh environmental conditions and the aggressive effects of the refrigerant. Using the right caps is essential for the long-term health and reliability of your air conditioning system.