Safe and durable construction: R12 to R134A retrofit conversion adapter, safe and durable, made of quality metal and PP with heat resistance. Easy disconnect: Charge port adapter accepts R134a quick disconnect, converting your old 1/4 inch SAE or 7/16 inch 20UNF R12/R22 charging port for R134A service. Detachable valve: Fittings include a detachable valve with an air valve, attached to the thread for use with the valve, and a protective cap for quick and easy installation. Removable valve: AC Connector Port Adapter features a removable valve for easy disconnection and connection for quick and straightforward use. Applications and use scenarios Automotive A/C retrofit: Use this adapter to connect a standard R134A charging system to older vehicles with R12 or R22 ports (1/4 inch SAE or 7/16 inch 20UNF), enabling retrofitting to R134A. In retrofits and service: Ideal for shops performing R12/R22 to R134A retrofits on cars, trucks, and equipment, providing reliable quickdisconnect compatibility and easy valve handling. Field and mobile service: Suitable for onsite A/C service where quick, secure connections and easy disconnection are needed for efficient charging and maintenance.