Weber # 70401 - Snap-Fit Igniter for Q models manufactured from October 2005 & later. Weber #70401 Snap-Fit Igniter for Weber #70401 Weber Q Snap Fit Red Igniter If the leg frame has been replaced for a grill manufactured prior to 10/05, you must replace the igniter with this snap-fit igniter. The original threaded style igniter will not fit the new leg frame. Please visit Weber's website to ensure you order the correct parts for your specific grill. It is best to look up by serial #. The following link will also help you find the alpha numeric number. http://help.weber.com/schematics/#serial-number