The OS #7 Glow Plug has a slightly hotter heat range than the OS #8 plug. This newly developed plug focuses on easier running at low and medium speeds, and is ideal for helicopter engines with superior performance around hovering RPM range.
It is also great all around plug for most 2 stroke aircraft, helicopter and
car (except turbo head) engines.
Plug is medium length, without idle bar. One glow plug and one brass washer. Plug threads 1/4-32.