Johnsen's (6313 R-134a AC Refrigerant + UV Dye Glow Charge 12oz (3 Cans) A fast and easy method to recharge an A/C system and detect leaks using an SAE-approved UV dye. May be used in any vehicle that uses R-134a refrigerant, including those originally equipped with R-134a and those that have been retrofitted from R-12 to R-134a. Leak finding is fast and efficient.