- O.S Type F Glowplug (4 Stroke)
- The OS Max F Glow Plug is Designed Especially for Four-Stroke Engines.
- FEATURES: Specially shielded long-reach plug for use in O.S. (and other)
- four stroke engine. Shield keeps plug hot for lower idle RPM.
- For use with fuels with a 5-15% nitro content