OS Engines 71653000 LC3 Hot Traxxas Glow Plug Best suited for 5%-15% nitro fuel content. FEATURES: Designed for use in .12 – .15 – .18 – .21 size engines used in monster trucks such as the original and newer 2.5/3.3 Traxxas T-Maxx/REVO. **NOT for use with the Traxxas 2.5R Racing Engine.** Like all O.S. Max glow plugs, the LC3 is tough enough to take the heat and provide hassle-free starts and outstanding durability High-performance long reach glow plug suitable for 1/10 scale off-road applications that require constantly varying speed The LC3’s longer reach extends coil farther into the engine’s combustion chamber improving combustion for better idling and good acceleration throughout the throttle range Compatible with Traxxas’s EZ-Start system No idle bar