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Lennox 39W70 Expansion Valve 319847-401 you know that a reliableThe Lennox 39W70 Expansion Valve is a critical OEM replacement part designed for precise refrigerant flow control in high performance HVACR systems. Engineered for compatibility with Lennox G43 series GreenHeat and G52 GreenVent heat pumps, this thermostatic expansion valve (TXV) ensures optimal superheat maintenance across varying load conditions. For technicians servicing residential air conditioning or commercial refrigeration units, the 39W70 is