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Bard part number 1921-017 is an OEM silicone vent terminal gasket used on Bard wall-mounted HVAC equipment to seal the vent terminal connection and help prevent unwanted air leakage and moisture intrusion at the cabinet-to-vent interface. A properly fitted vent terminal gasket supports safe, consistent combustion air and flue gas routing on compatible Bard gas/electric wall mount units, while also reducing nuisance drafts that can affect unit operation. For best results, confirm the exact unit model and serial number and compare the old gasket shape and mounting pattern before ordering, since vent terminal gasket styles can vary by series and vintage.