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Bard part number 800-0098 is an OEM cap tube assembly used as a fixed refrigerant metering device in Bard wall mounted air conditioners and related Bard HVAC equipment. The capillary tubing creates the designed pressure drop that feeds the evaporator with the correct refrigerant flow for stable cooling and proper superheat, so a restricted, kinked, or contaminated cap tube can show up as poor capacity, coil icing, or abnormal system pressures. Because metering devices are very application specific, match 800-0098 to your unit model and serial before ordering, and have a qualified technician replace it to ensure the system is properly sealed, evacuated, and charged to Bard specifications.