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Bard part 800-0450 is an OEM cooling distributor used in Bard wall mounted air conditioners and heat pumps to split refrigerant flow evenly into the indoor evaporator coil circuits, helping the coil feed properly for stable cooling performance. When a distributor is restricted, leaking, or damaged, you can see symptoms like poor capacity, uneven coil frosting, and abnormal superheat, so replacing it with the correct Bard OEM part is important for proper metering and coil balance. This is a refrigerant circuit component that should be installed by a qualified HVAC technician, and you should confirm compatibility by matching the part number to your unit model and serial information before ordering.