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The Bard 5651-157 expansion valve is an OEM refrigerant metering component used in Bard wall-mount air conditioners and heat pumps to control refrigerant flow into the evaporator for stable suction pressure and proper coil superheat. With 3/8 inch by 3/8 inch line connections, this valve is a direct-fit service replacement when a unit is experiencing symptoms like improper cooling, erratic pressures, or a restricted or stuck metering device. Because expansion valves are application-specific, confirm the exact Bard model and serial number compatibility in the unit service literature before ordering to ensure correct capacity and connection match.