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Bard part number 5201-009BX is an OEM bi-directional heat pump filter drier with 3/8 inch connections, used in Bard wall mounted heat pump refrigeration circuits to help keep moisture, acids, and debris from circulating through the system. Because heat pumps reverse flow between heating and cooling, a bi-directional drier is the correct choice to protect the metering device and reversing valve in either operating mode. This replacement is a smart fit when correcting a restriction, addressing a burnout cleanup, or anytime the sealed system has been opened and you want to restore long term reliability. Verify fit by matching your Bard model and serial number and confirm the connection style and line size 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.