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The Bard 5651-226 is an OEM thermal expansion valve (TXV) with 3/8 inch by 3/8 inch connections used in Bard wall mount air conditioners and other Bard refrigeration circuits to meter refrigerant into the evaporator at the correct rate. A properly operating TXV helps maintain stable suction conditions and prevents common performance issues tied to improper superheat, such as poor cooling, coil icing, or compressor stress. This Bard factory part is a direct-fit replacement intended to restore original refrigerant control and system efficiency, so match the part number to your unit model and verify line size and application before installation.