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How should I place this refrigerant canister after use?
It should be placed vertically in a ventilated dry place.
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Is this an empty tank or is it pre-filled with other gases?
He's an empty can.
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Is it possible to use a different refrigerant if the tank is evacuated?
The Freon recovery tank is an empty tank. Do not mix the recovered refrigerants. only the same refrigerant can be recovered in one recovery tank