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The Bard 905-0301 Expansion Valve Assembly is an OEM refrigerant metering component used in select Bard wall mounted packaged air conditioners to regulate how much refrigerant enters the evaporator coil. A properly matched expansion valve helps the system maintain stable superheat and prevents common performance problems like coil flooding, poor cooling, or icing that can show up when the metering device is sticking or out of calibration. Because TXV fit and charge characteristics are model specific, confirm compatibility with your unit model and serial before ordering, and plan on standard refrigerant handling steps such as leak checking, replacing the filter drier if the system has been opened, and evacuating and weighing in the correct charge per the Bard service literature.