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Bard part number 1804-0563BX is an OEM Extension Tube Assembly supplied boxed, used on select Bard wall-mounted HVAC equipment as an inline tubing extension that helps complete the intended system piping or connection run during service or component replacement. In the field, this type of Bard factory tube assembly is typically used to restore correct routing and fit without improvised splices, which helps maintain proper clearances, reduces the chance of vibration related rub-through, and supports reliable long-term operation when installed per the correct unit parts list. Verify the exact match by model and serial number before ordering, since extension tube lengths, bends, and end connections can vary by unit series and revision.
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.