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Bard 800-0052 cap tube assembly is an OEM refrigerant metering component used in select Bard wall mounted air conditioners to regulate liquid refrigerant flow into the evaporator circuit for stable cooling performance. When a system shows symptoms like improper superheat, restricted flow, or inconsistent coil temperatures, replacing the capillary tube assembly with the correct Bard part helps restore the factory designed refrigerant feed and protects the compressor from abnormal operating conditions. Confirm compatibility by matching the part number to your unit model and serial in the Bard parts list or service manual before ordering, since cap tube sizing and connections are application specific.