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The Bard 800-0478 Orifice Assembly is an OEM refrigerant metering component used in select Bard wall mounted air conditioners and heat pumps to regulate refrigerant flow into the evaporator circuit for stable capacity and proper superheat. A worn, restricted, or incorrect orifice can contribute to poor cooling, icing, or abnormal pressures, so replacing with the correct Bard factory part helps restore the unit to its intended performance. Confirm compatibility by matching the full unit model and serial information and comparing the original metering device specifications before ordering.