Service Port adapters to convert R12 vehicle connections to R134a refrigerant. Vehicles manufactured prior to 1991 with air conditioning will have had an R12 system. R12 is a CFC refrigerant and is now banned with the European Union. In order to get the system recharged the older 1/4" and 3/16" sae service ports need to be converted to allow connection to the more widely available R134a service machines.
