Johnsens, 12 OZ, R-134A, A/C Automobile Refrigerant, With Leak Sealer, Helps To Recharge A Low R-134A A/C System & Detect & Seal Most Common A/C Leak In O-Rings Or Gaskets, For Use In Factory Installed &/Or Retrofitted R-134A Auto A/C Systems, Includes Standard Acme Threaded Cap.