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The Bard 800-0159 Cap Tube Assembly is an OEM refrigerant metering component used in Bard wall mounted air conditioners and heat pump units to regulate liquid refrigerant flow into the evaporator, helping the system maintain proper pressures, stable superheat, and consistent capacity. When a cap tube is restricted, damaged, or leaking, symptoms often include poor cooling, coil frosting, or abnormal suction pressure, so replacing it with the correct Bard part number helps restore factory performance and reliability. Match 800-0159 to your unit model and serial information and follow proper sealed system service practices, including evacuating and weighing in the correct refrigerant charge after installation.