DieselRx DRX00058-8 - Glow Plugs For Duramax 6.6L with LLY, LB7 Engines - Pack of 8 Allows for faster engine startups, Helps reach optimum temperatures quickly Controls current draw for rapid heat of coil, resists corrosion and vibration Superior electrical insulation and high thermal conductivity, Protects coils from exhaust gas damage DieselRxglow plug peaks approximately 40F higher during the initial in rush of current. The lower stabilized temperature translates to a longer lasting glow plug. This purchase includes set of 8 DRX glow plugs