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Bard part 800-0137 is an OEM cap tube assembly used in the refrigerant metering circuit of select Bard wall mount and packaged HVAC units, helping control the flow and pressure drop of refrigerant feeding the evaporator so the system can maintain stable cooling performance. When a cap tube becomes restricted, damaged, or develops a leak, symptoms can include poor capacity, frost or icing concerns, and abnormal operating pressures, so replacing it with the correct factory-calibrated Bard assembly helps restore proper system operation. Because cap tube applications are model and capacity specific, confirm 800-0137 against your unit model and serial number or the Bard parts list before ordering, and have installation handled with proper refrigeration service practices.