Please refer to your instruction manual and make sure it's compatible.
Compatible with SHOCKWAVE, TSUNAMI, VOLCANO STX, TORNADO S30, VOLCANO S30, AFTERSHOCK 21, HURRICANE XL, AFTERSHOCK 3.0, AFTERSHOCK 3.5, BACKDRAFT 3.5, CALDERA 3.0, EARTHQUAKE 3.0, EARTHQUAKE 3.5, HURRICANE XP, LANDSLIDE 21, LANDSLIDE LT, MAELSTROM LT, MONSOON XP, SANDSTORM 21, SANDSTORM LT, TWISTER LT, TYPHOON XP, REACTOR RS 3.3, VOLCANO MX, VOLCANO SV, VOLCANO T2, VORTEX SS, TORNADO BB and more... Medium for club racing and sport use.

Model : #4 N4 Spark Glow Plug
The tungsten filament of N4 is more bolder than the N3,more durable.
Longer lasting element
For 4c Engines
For 5% - 40% Nitro Fuels
Improves Idle and transition;
Hex Size: 8mm
Quantity:3Pcs/5Pcs(Optional)

Package includes:
3Pack No.4 Hot Glow Plug