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Bard part 905-0406 is an OEM filter and thermal expansion valve assembly used in the refrigerant circuit of Bard wall mounted air conditioners and heat pumps to help keep the liquid line clean and regulate refrigerant flow into the evaporator for stable cooling performance. Replacing a restricted or malfunctioning TXV assembly can resolve symptoms like poor capacity, coil icing, high superheat, or inconsistent suction pressures, while the integrated filtration helps protect critical components from moisture and debris. Because this is a sealed refrigeration repair, confirm the exact unit model and refrigerant type before ordering, and plan on standard refrigeration best practices such as proper evacuation, leak checking, and weighing in the charge after installation.