Product Description Most Important Item for Installing a Mini Split System Ductless Air Conditioner with Flare Type Line Set Pipe Connections. Creates a Leak Free Seal at the flare connections. Helps Prevent Expensive Service Calls to replenish lost refrigerant. Saves the environment. Made of PPOE Refrigerant Oil using a special process. Compatible with R410a Refrigerant. Will not contaminate or clog the system even if it enters into the refrigeration system. 2cc tube provides sufficient amount for one system installation. Buy more and save on shipping. Use on all Flare Type Connections commonly found on most Mini Split Ductless Air Conditioners and Heat Pumps. Helps establish a much tighter and leak free connection. Saves hundreds of dollars in service calls to replenish leaked refrigerants. Will not dry up. Apply to the front and back of the flare cones on copper pipe ends to seal all mating surfaces. Made in the U. S. A.