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Bard part 5201-015 is an OEM 1/4 inch liquid line filter drier with sweat (ODF solder) connections, commonly used in Bard wall mounted and other packaged HVAC equipment to help keep the sealed refrigeration circuit clean and dry. Installed in the liquid line, this drier is designed to trap moisture, acids, and fine debris that can lead to restrictions, freeze ups, and premature compressor or metering device issues after a repair or refrigerant circuit opening. If you are replacing a compressor, fixing a leak, or correcting a contamination event, installing the correct Bard 5201-015 drier is a standard best practice for restoring reliable operation. Confirm line size and flow direction during installation, and verify application and refrigerant compatibility against your Bard unit literature before ordering.