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The Bard 5651-213 is an OEM cooling thermal expansion valve (TXV) with 3/8 inch by 3/8 inch connections, used in Bard wall mounted air conditioners and environmental control units to meter refrigerant into the evaporator based on coil conditions. A properly operating TXV helps maintain stable superheat, supports consistent capacity, and protects the compressor from floodback during changing loads. If you are chasing symptoms like poor cooling, hunting suction pressure, frosting at the coil, or erratic superheat readings, replacing the TXV with the correct Bard part number is often the right fix for proper refrigerant control and reliable system operation.