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Bard 5651-200BX is a genuine OEM thermostatic expansion valve (TXV) with 3/8 inch x 3/8 inch connections, used in Bard wall mount air conditioners to meter refrigerant flow into the evaporator coil so the system can maintain proper superheat and stable cooling performance. If you are chasing low suction pressure, coil starvation, hunting, or a restriction that points back to the metering device, replacing the valve with the correct Bard part helps restore the factory refrigerant control the unit was designed for. Verify tonnage and model match before ordering, since TXVs are sized and applied by unit configuration and 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.