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The Lennox Y4141 is a genuine OEM 1-inch plastic solenoid valve rated for 24V operation with threaded connections, designed to precisely control the flow of refrigerant or water in compatible Lennox HVAC systems. If your system is experiencing uncontrolled flow, failure to switch between heating and cooling modes, or erratic operation, a faulty solenoid valve may be the cause. This OEM replacement part ensures proper fit and reliable performance in all Lennox systems that call for the Y4141 specification.