This is the SuperTigre #4 Hot Glow Plug used in the SuperTigre .18 Marine Engine. FEATURES: High heat range for excellent idle and acceleration Designed especially for boating applications and conditions INCLUDES: SuperTigre #4 Hot Glow Plug with Washer REQUIRES: Glow plug wrench, HCAP2550 jxs 7/07/09 ir/jxs