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The Lennox 53W06 is a genuine OEM expansion valve assembly (R48573-007) that meters refrigerant flow through the evaporator coil to maintain correct superheat levels and peak system efficiency in Lennox equipment. Signs of a failed expansion valve assembly include poor cooling output, liquid refrigerant slugging back to the compressor, or uneven temperature distribution. This complete factory-original assembly simplifies installation and ensures your Lennox system operates at full rated capacity.