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The Bard 800-0029 cap tube assembly is an OEM refrigerant metering component used in Bard wall-mounted HVAC equipment to regulate refrigerant flow into the coil and help maintain proper system capacity and stability. If your unit is showing symptoms like poor cooling, erratic superheat, or repeated freeze-up that points to a restricted or leaking metering device, replacing the cap tube assembly with the correct Bard factory part helps restore the designed refrigerant balance and protects the compressor from abnormal operating conditions. Because cap tube sizing and routing are application-specific, confirm compatibility by matching the part number to your Bard model and serial information before ordering.