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The Bard 8406-008 is an OEM SPST pressure switch used as a safety and proving device in Bard wall mounted HVAC equipment. It monitors system pressure and opens or closes its contacts to verify correct operating conditions, helping protect key components and prevent nuisance shutdowns when airflow or pressure conditions are not within the expected range. As a direct-fit Bard factory part, 8406-008 is the right choice when you need to restore reliable unit operation after a failed or intermittently tripping pressure switch. Verify the exact application by matching the part number on your existing switch and confirming unit model and serial information before ordering.