Extreme is the leak sealer that solves problems related to micro-leaks of refrigerant gas in vehicle air conditioning systems, 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, Extreme is safe and does not damage air conditioning system components. Visible under UV light. More information on the website errecom.com.