The O.S. #8 glow plug is the most widely used O.S. glow plug.
Recommended for most current O.S. (and other brands of) 2-stroke R/C engines.
Medium heat range plug for most model engine applications.
Plug is medium length, without idle bar. For all 2 stroke engines.
One glow plug and one brass washer
Threads on the plug are 1/4-32.