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The Bard 5220-013BX pulsation dampener muffler is an OEM refrigerant system component used in select Bard wall mounted air conditioners and heat pumps to help smooth compressor discharge pulsations and reduce vibration transmitted into the refrigerant lines. In the field, this part is commonly replaced when a unit develops a noticeable discharge line rattle or compressor related noise, or when the original muffler shows signs of fatigue, leakage, or damage from vibration. Using the correct Bard factory part helps maintain proper line routing, fit, and long term reliability compared with generic substitutes, and it is best practice to confirm compatibility by matching the part number to your unit model and the Bard parts list 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.