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The Bard 800-0199 Heating Cap Tube Assembly is an OEM refrigerant metering component used in Bard HVAC equipment to help regulate refrigerant flow during the heating cycle, supporting proper pressure drop and stable system operation. When a cap tube assembly is restricted, leaking, or mismatched, heat output and overall performance can suffer, so replacing it with the correct Bard factory part helps restore reliable heating and maintain the unit’s intended operating characteristics. For best results, verify compatibility by matching your unit model and serial information to the Bard parts list before ordering, since cap tube assemblies are application-specific within Bard wall-mount and similar packaged systems.