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The Bard 800-0013 cap tube assembly is an OEM refrigerant metering component used in select Bard wall mount and other packaged HVAC equipment to regulate refrigerant flow into the evaporator for stable, efficient cooling. When a capillary tube becomes restricted, kinked, or damaged, it can lead to poor capacity, abnormal pressures, or icing concerns, so replacing it with the correct Bard factory part helps restore proper system balance and reliability. Match Bard 800-0013 to your unit model and serial or the parts breakdown for your specific equipment before ordering to ensure correct fit and performance.