This is the O.S. T-Series RP6 Medium Heat Range Turbo Glow Plug.
FEATURES: T-series glow plugs are ideal for racing car engines that create high RPM For .12, .15 and .21 size turbo head on-road...
The OS Max #F Glow Plug is Designed Especially for OS Max (and other brands of) Four-Stroke Engines.
FEATURES: Specially shielded long-reach plug for use in four stroke engines. Shield keeps plug hot...