A/C Pro Max Seal restores lost refrigerant and oil and quickly brings back cool air while also lubricating the A/C compressor. The specialized formula helps protect metal system components against corrosion and corrosion induced leaks. It also stops existing rubber leaks by reconditioning rubber O-rings, gaskets and hoses.Prevents metal leaksAnti-corrosion additives help shield against metal leaksStops rubber leaks and reconditions seals