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The Bard 800-0072 Cap Tube Assembly is an OEM refrigerant metering component used in select Bard wall mount and packaged HVAC systems to regulate refrigerant flow through the cooling circuit for stable evaporator performance and proper system capacity. If your unit is showing symptoms like improper superheat, restricted cooling, or a suspected metering issue after confirming airflow and charge are correct, replacing the capillary tube assembly with the correct Bard part helps restore factory operation and fit. Because cap tube sizing is application-specific, match the part number to your unit model and serial before ordering, and have installation completed by a qualified technician using proper refrigeration service practices.