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The Bard 5651-217BX is an OEM thermal expansion valve used in Bard wall-mounted air conditioner refrigeration circuits to meter refrigerant into the evaporator coil based on operating conditions. When a system shows poor cooling, unstable superheat, frosting at the coil, or symptoms consistent with a restricted or stuck metering device, replacing the valve with the correct Bard part helps restore proper refrigerant control and overall unit performance. This boxed expansion valve is commonly referenced for R-410A applications with 3/8 inch connections and is listed for use on select Bard models such as J17A2-A and J24A2 series units, so match your model and refrigerant 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.