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The Bard 800-0077 cap tube assembly is an OEM refrigerant metering component used in Bard wall mounted air conditioners and heat pump systems to feed the evaporator with the correct refrigerant flow for stable cooling performance. When a capillary tube becomes restricted, damaged, or leaking, the unit can show poor capacity, icing, or abnormal pressures, and replacing the metering assembly with the correct Bard part helps restore proper system balance and reliability. Because cap tube sizing and routing are application-specific, match Bard 800-0077 to your unit model and serial number before ordering, and have installation and refrigerant handling performed by a qualified technician.