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Bard part number 8301-063-004F is an OEM program smart key used with Bard LC5000 lead lag controllers and compatible MULTI-TEC control systems to load or update controller programming in the field. This specialized tool is typically used by service technicians during controller setup, replacement, or software revision changes to help ensure the controller logic and unit sequence operate as intended for the site configuration. Because programming versions and controller compatibility can vary by job and equipment family, verify your LC5000 and connected PLC system requirements before ordering to confirm 8301-063-004F is the correct program key for your application.