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Bard part number 905-0501 is an OEM Heating Expansion Valve Assy used in select Bard wall mount and packaged HVAC units to meter refrigerant flow during heating operation so the system can maintain proper evaporator feeding and stable performance across changing load and outdoor conditions. A correctly sized, factory-matched expansion valve helps prevent common symptoms like poor heating capacity, frosting, or erratic suction pressures that can occur when the metering device is restricted, leaking, or out of calibration. Because expansion valves are application-specific by model and revision, confirm 905-0501 against your unit nameplate or the Bard parts list before ordering and replace the sensing bulb/insulation and any disturbed seals per the service procedure to avoid repeat issues.