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The Bard 800-0129 cap tube assembly is an OEM refrigerant metering component used in select Bard wall-mount HVAC equipment to regulate refrigerant flow and maintain proper evaporator performance. When a capillary tube becomes restricted, damaged, or has been opened during sealed system repairs, replacing it with the correct factory assembly helps restore stable suction pressure, consistent cooling, and dependable unit operation. Because cap tube sizing and routing are model-specific, confirm 800-0129 against your unit model and parts manual before ordering to ensure correct fit and refrigerant circuit compatibility.