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Bard 800-0179 is an OEM cap tube assembly used in Bard wall mounted air conditioners and heat pump systems to meter refrigerant flow from the high side to the evaporator circuit for stable cooling performance. When a cap tube becomes restricted, kinked, or leaks, the unit can show symptoms like poor capacity, coil icing, or abnormal suction pressures, so replacing it with the correct Bard factory part helps restore proper refrigerant control and reliable operation. Match this assembly by part number to your unit model and serial range, and have installation and refrigerant handling completed by a qualified HVAC technician to confirm correct charge and system performance after replacement.