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Bard part number 5203-003 is an OEM receiver (16 lb) used in the refrigeration circuit of select Bard wall mounted air conditioners and packaged equipment to provide liquid refrigerant storage and help maintain stable system operation across varying load conditions. When a receiver is leaking, restricted, or contaminated, it can contribute to poor cooling performance and inconsistent refrigerant feed, so replacing it with the correct Bard factory part helps restore proper refrigerant management and overall reliability. Confirm fit by matching the part number to your unit model and serial range before ordering, and follow standard refrigeration service practices for recovery, evacuation, and recharge after installation.