The Robertshaw 41-205 Hot Surface Ignitor (3 5/8 Inch) is a reliable ignition component designed for furnaces, boilers, and other gas-fired HVAC systems. It uses advanced silicon carbide technology to provide consistent, energy-efficient ignition without the need for a pilot light. https://www.partshnc.com/41-205-robertshaw-hotsurfaceignitor3-58