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old refrigerant is a gas and needs to be pumped out or removed via vacuum with the proper machine which deposits it into the same type of tank that new refrigerant is contained in because of pressure.

evacuating refrigerant into the air is dangerous and if inhaled is poisonous to people. not to mention illegal if in California. You could try one of those conversion kits from r12 to r134 hooking up the hoses may allow refrigerant to flow into an empty refrigerant btl.

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