The 69W43 Flame Sensor by TEKPRO is a crucial component for Lennox furnaces, specifically designed to detect igniter sensing rods for Ducane Armstrong and Lennox EL180 ML18UH models. Made with precision and quality, this heat sensor replacement kit is designed to assure accurate flame sensing and ensure consistent, efficient heating. The kit includes the igniter sensing rod, which fits seamlessly into the existing installation, eliminating the need for any modifications. The 69W43 Flame Sensor is engineered with advanced technology, delivering reliable flame sensing and igniter activation, thereby reducing energy waste and ensuring optimal furnace performance. With its high-quality construction and user-friendly design, TEKPRO's 69W43 Flame Sensor is an excellent choice for both professional installers and home enthusiasts.