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The Bard 800-0044 cap tube assembly is an OEM refrigerant metering component used in Bard wall mounted packaged air conditioner and heat pump systems to regulate refrigerant flow through the refrigeration circuit. When a capillary tube becomes restricted, damaged, or improperly sized, you can see issues like poor cooling performance, abnormal pressures, icing, or unstable operation, and replacing it with the correct factory part helps return the unit to Bard intended capacity and reliability. Because metering devices are application specific, confirm your exact Bard model and serial number and follow proper refrigeration service practices for recovery, brazing, evacuation, and charging when installing 800-0044.