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Bard 5201-001 is an OEM 3/8 inch liquid line filter drier used in Bard air conditioning and heat pump systems to help protect the refrigeration circuit by trapping moisture, acids, and debris before the refrigerant reaches the metering device and indoor coil. Replacing a restricted or saturated filter drier during sealed system service helps prevent corrosion, repeated contamination, and compressor damage, and it also supports proper refrigerant flow and stable system performance. Because correct fit and flow characteristics matter on Bard packaged and wall mounted equipment, using the factory Bard part number 5201-001 helps ensure compatibility with the original piping and service procedures for your unit.