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Bard part number 8000-331 is an OEM rotary compressor specified as Tecumseh RGA5510BAA (RG143AR-A4), designed for use in Bard wall-mounted air conditioner and heat pump applications that run R-410A refrigerant. A correct compressor match is critical for proper capacity, electrical loading, and long-term reliability, so confirm your unit model and serial number along with the compressor model number on the nameplate before ordering. This Bard OEM compressor is intended to restore normal cooling performance, stabilize operating pressures, and reduce nuisance trips that can occur when a compressor is worn, locked, or inefficient.