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The Bard 800-0221 Cooling Capillary Assembly is an OEM refrigerant metering component used in Bard wall mounted air conditioners to help regulate refrigerant flow through the refrigeration circuit for stable cooling performance. When a cap tube assembly becomes restricted, damaged, or leaks, you can see poor capacity, abnormal pressures, or coil icing, so replacing it with the correct Bard OEM part helps restore proper system operation and protects the compressor from running outside design conditions. Confirm application by matching the part number to your unit model and serial data in the Bard parts manual before ordering, since capillary assemblies are sized for specific systems and refrigerants.