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The Bard 5201-001BX is an OEM liquid line filter drier used in Bard air conditioning and heat pump refrigeration circuits to help protect the system by removing moisture, acids, and debris from the refrigerant before it reaches the metering device and indoor coil. With a 3/8 inch connection size, this drier is a common service replacement when a sealed system has been opened for repairs, after a component changeout, or any time contamination control is needed to support compressor reliability and proper cooling performance. If you are matching an existing Bard drier, confirm the line size and the correct Bard part number for your unit model and serial number before ordering.
Bard uses suffixes like "BX" to manage parts internally. These do not change the physical form or function of the part.
A part number ending in "BX" simply means it is packaged in a box for shipping, rather than for internal assembly use.
Example: 8406-142BX is physically identical to 8406-142.