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The Bard 800-0039 cap tube assembly is an OEM refrigerant metering component used in Bard wall-mounted air conditioners and heat pump equipment to control refrigerant flow into the evaporator, helping maintain proper pressures and stable cooling performance. When a system shows symptoms like poor cooling, abnormal superheat, or a restriction related issue, replacing the capillary tube assembly with the correct factory part is a common repair to restore the designed refrigerant feed and overall system operation. Because capillary assemblies are application-specific by unit model and capacity, confirm 800-0039 against your Bard parts list or model and serial number before ordering for correct fit and performance.