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The Bard 905-0040 Liquid Line Assembly is an OEM refrigerant line component used in Bard wall mount air conditioners and heat pumps to carry liquid refrigerant through the sealed refrigeration circuit between major components. Replacing a damaged or restricted liquid line assembly helps restore proper refrigerant flow, supports correct metering and charging performance, and can prevent nuisance pressure trips caused by a compromised line. Because refrigerant piping layouts and connection styles vary by unit series and capacity, match Bard 905-0040 to your exact Bard model and serial number before ordering, and have installation performed by a qualified technician following proper brazing, evacuation, and charging procedures.