O.S. Engines #7 Med Hot Air Glow Plug FEATURES: Slightly hotter heat range than the O.S; #8 plug Newly developed to focus on easier running at low and medium speeds Ideal for helicopter en INCLUDES: O.S. #7 Medium Hot Glow Plug with gasket REQUIRES: Glow plug wrench, HCAP2550 jxs 4/14/09 ir/jxs