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The Lennox 16V33 is a genuine OEM expansion valve engineered for use in compatible Lennox heating and cooling systems, providing precise refrigerant flow control to the evaporator coil for optimal thermal efficiency and system capacity. A faulty expansion valve can lead to symptoms such as poor cooling or heating performance, frozen evaporator coils, abnormal system pressures, and increased energy consumption. This direct OEM replacement is manufactured to Lennox specifications for a reliable, drop-in fit in applicable Lennox systems.