EXTREME ULTRA is an ultimate REFRIGERANT GAS LEAK SEALANT that solves all the problems related to small refrigerant gas leakages in AC/R systems. After more than 4 years of R&D efforts and thousand of tests, Errecom projected a 6ml dose leak stop that can work with all types of refrigerant gases included R32, R134a & R1234yf, EXTREME ULTRA 6ml new formula treats A/C and Refrigeration systems up to 21KW (6 tons).