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Bard part number 905-0307 is an OEM expansion valve assembly used in Bard wall mounted package air conditioners to meter refrigerant into the evaporator so the system can maintain proper superheat and stable cooling performance. If your unit is running with erratic suction pressure, poor capacity, or signs of improper refrigerant feed, replacing the metering device with the correct Bard valve assembly helps restore factory operation and protects the compressor by keeping the evaporator properly supplied under changing load conditions. Because expansion valves are application specific by model and refrigerant circuit, confirm compatibility by matching the part number to your Bard unit model and service literature before installation.