Enviro-Safe 1234YFArctic Air Note: This is not a refrigerant. It features a 134a piercing style top on the can, requiring the correct tap/hose for use. Enhanced Performance: A combination of 2 Enviro-Safe products for maximum cooling performance. Moisture Removal: Helps eliminate moisture in the A/C system, preventing corrosion and freezing. Friction Reduction: Reduces friction in the system, resulting in colder air duct temperatures in most cases. Compatibility: Compatible with any automotive refrigerant except ammonia and CO2. Additional Features: Promotes colder air. Enhances system longevity. Functions as an A/C booster. Heavy Duty Gauge Information: Usage Warnings: Not suitable for use in ammonia systems. Not suitable for use in CO2 systems. Cannot be shipped to Alaska or Hawaii or exported to foreign countries except in pallet quantities. Installation Details: Gas propelled. Installs the same as refrigerant. Cannot be added to a fully charged system.