EXTREME ULTRA is the leak sealer that solves problems related to micro-leaks of refrigerant gas in air conditioning systems of cars, including hybrids and electric ones. It acts on rubber and metal components, sealing micro-leaks up to 0.3 mm permanently. Compatible with all lubricants and refrigerant gases, including R12, R134a, R1234yf, and CO2. Ideal for prevention applications. With its safe and polymer-free formulation, Extreme Ultra does not react with moisture or oxygen and does not damage or block air conditioning system components. Visible under UV light. Includes adapter and flexible hose for easy connection to the system. More information on the website errecom.com.