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Bard 904-0641BX is an OEM preconditioning valve assembly supplied boxed for service replacement in compatible Bard wall-mount HVAC equipment. This valve assembly is used to route and control flow as required during the unit’s preconditioning sequence so the system transitions smoothly and operates as designed. Because correct fit and proper flow direction are critical on valve assemblies, match the part number to your unit’s parts list and confirm model and serial compatibility before ordering, especially if the unit has had prior field modifications.
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.