Extreme is a leak stop that repairs micro-refrigerant gas leaks in vehicle A/C systems, including hybrid and electric ones. It works on both rubber and metal components, permanently sealing leaks up to 0.01 inch. It can also be used to prevent micro-leaks. Extreme is compatible with all compressor lubricants and refrigerant gases, including R12, R134a, R1234yf and CO2. It can also be used with A/C systems of hybrid or electric vehicles. Thanks to its polymer-free formulation, Extreme is safe for the system: it does not react with moisture and oxygen and does not damage or block the AC/R system's components. Visible when exposed to any UV lamp. The universal dose for all vehicle A/C systems is 30 mL. The package includes adapters that simplify the insertion of the leak stop into A/C systems: - R134a adapter (black) - Flex Hose: it simplifies the insertion of the cartridge into the system. The adapters and the Flex Hose are reusable.