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The Bard S127-308-4 is an OEM thermostat base in gray that provides the proper mounting foundation and terminal access for compatible Bard wall mount and packaged HVAC thermostat assemblies, helping keep wiring secure and the control properly seated for reliable temperature control. If your existing base is cracked, stripped, or no longer holds the thermostat firmly, replacing it with the correct Bard base helps prevent loose connections and intermittent operation. This part has been listed as obsolete with an official replacement available, so verify the correct superseding part number for your unit before ordering.