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Bard part 800-0165 is an OEM cap tube assembly used in the refrigeration circuit of select Bard wall-mount and packaged air conditioners to meter refrigerant flow and maintain the correct pressure drop feeding the evaporator. When a cap tube becomes restricted, kinked, or damaged, the unit can lose capacity and run with abnormal pressures, so replacing it with the correct factory assembly helps restore proper cooling operation and dependable system performance. Because cap tube sizing and routing are application-specific, confirm 800-0165 against your Bard model and serial number before ordering, and have installation and refrigerant work completed by a qualified HVAC technician.