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The Bard 800-0071 expansion valve assembly is an OEM refrigerant metering component that helps your Bard wall mount air conditioner maintain proper superheat by regulating refrigerant flow into the evaporator coil. When a valve begins to stick, hunt, or leak, it can lead to poor cooling, coil frosting, unstable suction pressure, or compressor protection trips, so replacing it with the correct Bard factory part is important for reliable performance. This 800-0071 assembly is intended to match Bard system fit and operation as designed, helping restore normal evaporator feeding and overall capacity when servicing compatible Bard wall mounted equipment.