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The Bard 800-0103 cap tube assembly is an OEM refrigerant metering component used in select Bard wall-mounted air conditioners and packaged HVAC units to regulate refrigerant flow and maintain proper system pressures and cooling performance. Capillary tube sizing and routing are critical to charge balance and efficiency, so replacing a restricted, kinked, or leaking cap tube with the correct Bard 800-0103 helps restore stable operation and protects the compressor from abnormal conditions. Confirm the exact part number against your unit model and serial number, and follow standard refrigeration practices for brazing, evacuation, and recharging to factory specifications after installation.