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The Bard 905-0408 Filter/Expansion Valve Assy is an OEM refrigerant metering and filtration assembly used in Bard wall-mounted air conditioners and heat pumps to help regulate refrigerant flow into the evaporator while also protecting the refrigerant circuit from moisture and debris. Replacing a restricted or failed valve and filter assembly can correct issues like poor cooling performance, coil icing, high superheat, and unstable suction pressure, while helping the system maintain proper capacity and efficiency. This is a genuine Bard replacement part intended to match factory fit and connection points, so confirm the correct part number for your unit model and serial before ordering and have installation handled by a qualified HVAC technician due to refrigerant handling requirements.