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The Bard 5651-215 expansion valve is an OEM refrigerant metering component used in Bard wall mounted air conditioners to regulate refrigerant flow into the evaporator for stable superheat control and consistent cooling. A properly operating valve helps maintain correct system pressures and protects the compressor from liquid floodback, making it a common fix when you see poor cooling, hunting, or icing tied to metering issues. This 3/8 inch valve is built to Bard specifications for proper fit and dependable operation, and it is best practice to confirm the model and serial number application before ordering and to replace the filter drier and evacuate the system properly whenever the sealed system is opened.