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Bard part number 5651-227 is an OEM expansion valve with 3/8 inch by 3/8 inch connections, used in Bard wall mounted air conditioners to meter refrigerant into the evaporator so the system can maintain stable superheat and consistent cooling. A properly functioning expansion valve helps prevent coil freeze ups, poor capacity, and erratic pressures, making it a common repair item when performance is inconsistent or when a sealed system component has been opened for service. Use this Bard OEM valve to restore correct refrigerant flow control and dependable operation, and confirm fit by matching the part number and connection size to your unit and service literature before ordering.