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Bard 800-0108 is an OEM cap tube assembly used in Bard wall mounted air conditioners to meter refrigerant flow through the system as part of the refrigeration circuit. A properly sized capillary tube helps maintain stable evaporator feeding, supports correct suction and head pressures, and can prevent issues like poor cooling, coil icing, or inconsistent capacity when the original tube becomes restricted, damaged, or leaks. Because cap tube assemblies are application specific by model and refrigerant circuit design, confirm your unit model and serial number and match the part number before ordering to ensure proper fit and performance.