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Bard part number 8000-031 is an OEM compressor assembly specified as AG122RT-003-A4, used in select Bard wall-mount air conditioners to restore proper refrigerant circulation and cooling capacity when the original compressor has failed or is electrically/mechanically compromised. This is a hermetic reciprocating R-22 compressor in the Tecumseh AG series class, typically matched to 200 to 230V three-phase applications and commonly associated with approximately 54,000 BTU capacity and standard sweat connections (7/8 inch suction and 1/2 inch discharge), making correct model and revision verification critical before ordering. As with any compressor replacement, confirm the exact Bard unit model and serial, and plan on proper system cleanup (evacuation, drier replacement, and oil and refrigerant management) to protect the new OEM compressor and keep the system operating to factory expectations.