A standard vacuum pump designed specifically for evacuation and dehydration can be used as a recovery device only when it is used with what kind of container?

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Using a standard vacuum pump for evacuation as a recovery device works only when the refrigerant is directed into a container that is not pressurized. The pump creates a vacuum to pull refrigerant into the receiving vessel, and that suction relies on the container being at atmospheric pressure. If the receiving container were already pressurized, the existing pressure would push refrigerant back toward the appliance or into the pump, creating safety hazards and preventing proper recovery. A non-pressurized container provides a safe, low-pressure receiving space for the refrigerant to be drawn in and stored under the vacuum process.