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The Bard 5202-009 suction accumulator (5/8 inch connection) is an OEM refrigerant circuit protection component used on select Bard wall mounted air conditioners and heat pumps to help prevent liquid refrigerant floodback from reaching the compressor during low load or cold weather operation. A properly functioning accumulator supports reliable compressor lubrication and can reduce nuisance damage from slugging, making it a smart replacement when a system has had a compressor failure, oil return issues, or evidence of liquid carryover. Because accumulators are application specific by capacity and tubing layout, confirm part number 5202-009 against your unit model and parts list before ordering.