O.S. T-P4 glow plug is for use with fuel containing 25% or greater nitromethane content. Metal construction. This glow plug is different from the conventional glow plug. It has a slight taper on the bottom allowing it to sit flush with the combustion chamber. This product includes one glow plug.

For use with the .21VZ-B VSPEC and .21VZ-B Speed Tuned Engines
For installation and removal, use an 8mm nut driver