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Bard part number 5201-010 is an OEM bi-directional heat pump filter drier with 3/8 inch sweat connections, used in the refrigerant circuit to help capture moisture, acids, and debris that can damage the metering device and compressor. On Bard wall-mounted heat pump systems, this drier supports reliable operation in both heating and cooling flow directions, making it a common service item during sealed-system repairs, component replacements, or after any time the system has been opened. For best results, confirm your unit model and parts list match before ordering, and have the replacement installed by a qualified technician following proper brazing, evacuation, and charging procedures.