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The Bard 800-0337 TXV Assembly is an OEM thermostatic expansion valve assembly used in Bard wall-mounted air conditioners and heat pumps to meter refrigerant into the evaporator and maintain stable superheat for reliable cooling performance. A properly operating TXV helps prevent coil freeze-ups, protects the compressor from poor refrigerant control, and supports consistent capacity across changing loads. This Bard factory part is built to match original fit and function, but because TXV selection is system-specific, confirm the exact model and serial compatibility in your Bard parts list or service literature before ordering.