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The Bard 800-0144 cap tube assembly is an OEM refrigerant metering component used in Bard wall-mounted air conditioners and related packaged units to control refrigerant flow into the evaporator for stable cooling performance. A properly sized capillary tube is critical for correct superheat and overall system efficiency, so replacing a restricted, damaged, or leaking cap tube with the correct Bard part helps restore normal pressures and capacity without guesswork. Because cap tube assemblies are application-specific by model and refrigerant circuit, confirm the exact unit model and serial before ordering to ensure proper fit and operation with your Bard system.