IDQ R-134a AC Recharge Hose Adapter - 1 Count IDQ R-134a Refrigerant AC Recharge Hose Adapter allows the safe use of older piercing-style car AC recharge hoses with R134a refrigerant cans that are fitted with self-sealing valves. To use simply screw the adapter to your R-134a recharge can (not included). Then screw the hose from your recharge kit (not included) onto this adapter and you re ready to start restoring the AC refrigerant in your vehicle. Just follow the regular recharge instructions found on your can of car AC refrigerant. This adapter is not for use with AC refrigerant 134a cans that require piercing. This package contains one AC recharge hose adapter.