The Perkins 2666108 Thermostart Glow Plug is a genuine OEM 12-volt starting aid designed to ensure reliable cold weather starting for a wide range of Perkins engines. This essential component facilitates efficient fuel ignition in low temperatures, crucial for optimal engine performance and longevity. Measuring approximately 95mm in length, 20mm in width, and 51mm in height, and weighing 0.12 kg, it is a direct replacement part, ensuring perfect fit and function across compatible Perkins 100, 400, 1100, 3.152, 4.236, and 6.354 series engines.