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The Bard 1804-0426BX Extension Tube Assy - Boxed is an OEM refrigerant-line extension tube assembly used in Bard wall-mounted air conditioners and heat pumps to bridge two refrigeration components when service access or replacement requires added reach and correct alignment. In the field, this part is typically used to restore proper tubing geometry after a repair so connections seat correctly, stresses are reduced, and refrigerant flow stays consistent with factory design. Because tubing layouts can vary by model and vintage, confirm the exact unit model and serial range in the Bard parts manual before ordering to ensure the correct fit and connection style for your application.
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.