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Bard part 8620-254 is an OEM SmartKey Kit designed for Bard D Series wall-mount HVAC units, providing a keyed access solution to help control authorized entry during service and maintenance. This kit is used when you need to replace a damaged or missing keyed lock set or standardize access across a site with multiple Bard D Series units. Because fit and keying requirements can vary by unit configuration, confirm your exact D Series model and existing lock arrangement before ordering to ensure proper compatibility and smooth installation.