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The Bard 800-0121 Cap Tube Assembly is an OEM refrigerant metering component used in Bard wall-mounted HVAC equipment to regulate refrigerant flow into the evaporator circuit for stable, efficient cooling. If your unit is showing symptoms like poor cooling, frosting issues, or improper superheat after other causes have been ruled out, replacing the capillary tube assembly with the correct factory part helps restore the designed refrigerant feed and system balance. Because metering devices are application-specific by model and configuration, confirm the 800-0121 matches your Bard unit model and serial before ordering to ensure proper fit and performance.