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Bard 5051-218BX is an OEM boxed condenser coil service replacement used in Bard wall mounted air conditioners to restore proper heat rejection when the original outdoor coil is leaking, corroded, or restricted. Replacing the condenser coil helps bring head pressure, capacity, and overall cooling performance back to spec, and using the correct Bard coil is important for matching the factory circuiting, connection points, and cabinet fit to avoid installation headaches. This is a coil-only service part intended for qualified HVAC service, and you should confirm compatibility by matching the part number to your unit model and serial information 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.