A/C PRO SUPER SEAL A/C Treatment for R-1234yf A/C systems contains chemicals that are activated by moisture to form a patch as the refrigerant passes through a leak. These chemicals seal leaks in the condenser, evaporator, accumulator, and receiver/drier A/C Pro Super Seal A/C Treatment contains conditioners and sealers that penetrate and rejuvenate O-rings, gaskets and other rubber connectors to prevent leakage, and also a drying agent to eliminate moisture. A/C Pro Super Seal A/C Treatment is vacuum packed without refrigerant and is compatible with lubricants that are commonly used in R- 1234yf car A/C Systems. A/C Pro Super Seal: Repairs Metal Leaks. Seals Rubber Leaks. R-1234YF System Compatible