This is one RB Concept "Turbo" #7 V3 Glow Plug. This is a "Cold" glow plug intended for use in .21 race engines with high nitro content fuels where a cold glow plug is needed.
The RB Turbo V3 glow plug is made with an updated wire which improves stationary RPM, while also lasting longer. The alloy used for the wire has been developed and tested in order to release the best glow plug for your engine in terms of performance and reliability. The body and the top pin get a special treatment that prevents oxidation. The construction of the plug keeps a specific process to ensure a perfect seal even under high pressures and extreme temperatures.