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The Lennox Y5413 is a genuine OEM pilot assembly with orifice for natural gas, specifically engineered for 2 through 7 section Lennox gas-fired induced draft hot water boilers. This pilot assembly is critical for reliable ignition; a faulty pilot can cause failure to light, intermittent ignition, or complete boiler shutdown. Installing this direct OEM replacement ensures safe, consistent ignition performance to original Lennox standards.