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Bard part number 5201-022 is an OEM A/C liquid line filter drier used in the refrigerant circuit of Bard wall-mounted air conditioners to help protect the system by trapping moisture, acids, and debris before they can damage the expansion device, compressor, or internal tubing. When a unit has been opened for repair, experienced a burnout, or shows signs of restriction, replacing the liquid line drier is a smart reliability step to restore proper refrigerant flow and keep the system running clean. This is a genuine Bard service part intended to match factory fit and performance, so confirm your exact model and refrigerant application before ordering and follow proper evacuation, brazing, and dehydration procedures during installation.