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The Bard 5201-020BX H/P liquid filter drier (boxed) is an OEM refrigerant-line protection component used in Bard wall-mounted heat pump systems to help keep the liquid line clean and dry by trapping moisture and contaminants before they can circulate through the metering device and compressor. Replacing a restricted or contaminated filter drier is a common best practice after a sealed-system repair or refrigerant circuit opening, and using the correct Bard part helps maintain proper refrigerant flow and dependable heating and cooling performance. Confirm fitment by matching the part number to your unit model and service literature, and have installation performed by a qualified technician since it requires opening the refrigerant circuit.
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.