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The Bard 905-0433 TXV Assembly is an OEM thermostatic expansion valve assembly used in Bard wall mounted air conditioners and heat pump systems to meter refrigerant into the evaporator coil under changing load conditions. A properly operating TXV helps maintain correct superheat, supports stable suction pressure, and protects the compressor by preventing floodback while keeping capacity and comfort consistent. This Bard OEM part is built for the correct internal calibration and connection fit used in Bard packaged equipment, making it the right choice when you are correcting poor cooling performance, hunting pressures, or a confirmed restricted or leaking metering device. Verify compatibility by matching the full unit model and serial information to the Bard parts list before ordering, since TXV specifications can vary by model and refrigerant.