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Bard part 800-0272 is an OEM drain back cap tube (drain back capillary) used in select Bard wall-mounted HVAC units to manage condensate drainage and help prevent unwanted water backup inside the cabinet. A properly functioning drain-back tube supports reliable moisture removal during normal cooling operation, which helps reduce nuisance water leaks and protects internal components. Because this is a small but critical fit-and-function part, verify your unit model and parts breakdown before ordering to ensure the correct drain-back configuration and routing for your Bard system.