RED TEK Dry12 A/C Dehydration Treatment (4 oz. can) Operation: Easy to use. Installs in minutes. Dry12 is activated by moisture in the system to form inert silicone oil which blends with the compressor lubricating fluid to further enhance lubrication. Lower Cost: Less expensive than removing moisture by mechanical evacuation. Saves time and money. Compatibility: Compatible with most common refrigeration materials and lubricants including R134a, R12, metal components, mineral and synthetic(Ester and PAG) lubricants, seals, gaskets, hoses, compressors, and o-rings. Environment: Saves energy by allowing refrigerant to fully condense on the "high side" of the system by eliminating system moisture. Less leaks lowers refrigerant emissions. Safety: Safe and easy to use. Does not contain harmful methanol.