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Bard part number 5651-103BX is an OEM thermostatic expansion valve with 3/8 inch by 3/8 inch connections used in Bard wall-mounted air conditioners and other Bard HVAC equipment to meter refrigerant flow into the evaporator coil. A properly matched TXV helps maintain stable evaporator superheat and supports reliable cooling performance, especially after a sealed-system repair where the original valve may be restricted, leaking, or out of calibration. Because fit and charge setup are critical on expansion devices, confirm the unit model and serial number and verify the connection size and application before ordering 5651-103BX for replacement.
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.