Designed for nitro buggy and truck racing, this is the R5 Cold Glow Plug from HPI.
Cold heat range
Unique blend of platinum and iridium metals
Standard plug design (no idle bar)
One glow plug
One brass spacer
Installation into the engine with a 4-way wrench
Height: .70" (17.8mm)
Thread size: 1/4-32
HPI recommends this plug for all of their .15 size engines but willwork for any engine that needs a cold glow plug.