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AC SMARTSEAL Auto is a leak stop which represents the evolution of AC SMARTSEAL, with a higher effectiveness that has allowed the reduction of the dosage to be used within the unit. Specifically designed to permanently repair leaks both in rubber and metal parts of a system, AC SMARTSEAL Auto guarantees a total seal for leaks. Its mechanical action works within the unit, without any kind of chemical reaction. AC SMARTSEAL Auto is polymer free: it is not reactive to oxygen and moisture and is suitable for any type of lubricant and refrigerant gas. While designing it, attention was paid to the new ecological refrigerant gases R1234yf, R1234ze. AC SMARTSEAL Auto has been widely tested on many models of compressors to ensure the normal operation. It has been shown that there is a reduction of the compressor noise. Similar evidence was found in the interaction with the recovery station that is neither clogged nor damaged. AC SMARTSEAL Auto particles are similar to the lubricant and refrigerant gases. AC SMARTSEAL Auto does not stop inside the drier filter and does not accumulate in the expansion valve.