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The Bard 800-0107 cap tube assembly is an OEM refrigerant metering component used in select Bard wall mounted HVAC equipment to help maintain correct refrigerant flow for stable cooling operation. If a system shows symptoms consistent with a restriction or incorrect metering, such as poor capacity, abnormal pressures, or coil freeze up, replacing the capillary tube assembly with the correct Bard part helps restore factory designed performance and reliability. Because cap tube sizing is application specific, verify the full model and serial number match before ordering to ensure proper fit and correct refrigerant control.