ITEM NAME:Retrofit 7/16 to 3/8 Conversion Adapter R12 to R134a High/Low AC Fitting A#S Product Description Description: Features: The R12 port of the charging port accepts R134a and disconnects quickly; Save time and effort, installation, light weight, fast; It can be used in conjunction with valves; There's a gas valve inside, and a plastic shield; These low / high side retrofit / adapters / accessories will take your old 3/16 or 1/4 R12 charging port, allowing it to accept R134a quick disconnect hose. Specifications: Product Name: high and low voltage conversion adapter for automobile air.These low / high side retrofit / adapters / accessories will take your old 3/16 or 1/4 R12 charging port, allowing it to accept R134a quick disconnect hose. The R12 port of the charging port accepts R134a and disconnects quickly;.