– O.S. Engine Glow Plug #P3 (Turbo) Ultra Hot

This is the P3 Glow Plug for use in the OS Max .21 VZ-V Spec and most
other .18 -.28 cu in (2.9 – 4.6 cc) turbo head racing engines.

FEATURES:

Ultra Hot Type Plug, designed for reliable low speed and more torque
at acceleration, suitable for 20% nitro fuel
Ideal for novice drivers, allows easy starts and better idling

SPECS:

Overall Length: 17mm (.67″)
Thread size: M8x.75mm

COMMENTS:

This glow plug is different from the conventional glow plug. It is
made to fit the inner head of engines with a turbo-type cylinder
head design

How to Choose the Right Glow Plug? Please refer to the following link.
http://www.osengines.com/accys/choosing-glowplugs.html