This is the P3 "Ultra Hot" Turbo Glow Plug for use in the OS Max .21 VZ-R, V-Spec, .12 TR and .18 TZ/TM and other O.S. Turbo head engines.
•Ultra Hot Type Plug
•Designed for reliable low speed and more torque at acceleration
•Suitable for 20% to 30% nitro fuel
•Ideal for novice drivers
•allows easy starts and better idling
See the O.S. Turbo glow plug chart below to compare the different Turbo glow plugs available for O.S. engines: