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Bard part number 5651-066 is an OEM thermal expansion valve used in Bard wall mounted air conditioners to meter refrigerant into the evaporator coil at the correct rate, helping maintain proper superheat and stable cooling capacity. This valve is a key mechanical refrigerant control component, and the 3/8 inch by 3/8 inch connections listed in the manufacturer description are commonly used on Bard TXV applications, making correct identification important when restoring factory performance after a restriction, leak repair, or component replacement. Match this Bard 5651-066 valve to your unit model and serial, and replace the liquid line filter drier and evacuate properly during installation to protect the new valve and compressor.