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Bard 1818-0054BX is an OEM flow switch stub assembly supplied boxed to help restore proper safeties on Bard commercial HVAC equipment that uses a flow proving circuit. The stub is used as the mounting and connection point for the flow switch so the control system can verify required airflow or fluid flow before allowing operation, helping prevent nuisance lockouts and protecting major components. Because fit and orientation matter on proving circuits, match this Bard part number to your unit model and wiring diagram or parts list to confirm compatibility 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.