AC SmartSeal External works on all materials — copper, aluminum, steel, plastic — and it’s great where copper meets aluminum. It works on holes up to about a fifth of an inch — and will last 12 to 15 years.
AC SmartSeal External is tested and compatible with all refrigerants and lubricants and won’t dissolve over time. Plus it won’t void warranties since it’s applied from the outside, with nothing going into the system.
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