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There are two needle valves on the left side of the air conditioning pump in the picture, one is a high-pressure needle valve and the other is a low-pressure needle valve.

When filling refrigerant, gaseous refrigerant must be filled from the low-pressure needle valve of the air conditioner under normal refrigeration operation.

If you are not a professional, it is recommended not to do it yourself, so as not to damage the air conditioning pump.