OS No8 GlowplugThe O.S. #8 glow plug is the most widely used O.S. glow plug for O.S. engines. Recommended for most current O.S. (and other brands of) 2-stroke R/C engines. Note that O.S. engine plugs are SHORT body plugs and should only be used in engines that require a short body plug. Features: Medium heat range plug for most model engine applications. Plug is medium length, without idle bar. For all 2 stroke engines.