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Bard 800-0127 is an OEM cap tube assembly used in Bard wall-mounted air conditioners and heat pump systems to meter refrigerant flow in the sealed refrigeration circuit. A properly sized and intact capillary tube helps the unit maintain stable evaporator feeding and normal operating pressures, which supports consistent cooling performance and helps prevent symptoms tied to restrictions or damage. Because cap tube assemblies are application-specific by length and internal diameter, match Bard 800-0127 to your unit model and serial before ordering, especially if you are troubleshooting a suspected metering device issue or replacing a damaged refrigerant line component.