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The Bard 5651-200 expansion valve is an OEM refrigerant metering component used in Bard wall-mount air conditioners and related equipment to regulate refrigerant flow into the evaporator for stable superheat and dependable cooling. Built to Bard fit and performance requirements, this valve is supplied with 3/8 inch x 3/8 inch connections to match the factory piping layout, making it a solid choice when you are correcting flooding or starving symptoms, replacing a restricted valve, or restoring proper capacity after a sealed-system repair. As with any metering-device replacement, confirm the exact part match to your unit model and serial number, and have installation and charging completed by a qualified technician following Bard service instructions.