The McCormick 3559893M1 is a genuine OEM glow plug, also cross-referenced as Massey Ferguson 3559893M1 and Perkins 2666108. Designed for various Massey Ferguson agricultural tractors, this 11V glow plug is crucial for efficient cold starting in diesel engines by preheating the combustion chamber. With an M10x1.25 thread, 12mm hex size, and 95mm overall length, it ensures reliable performance and durability, maintaining optimal engine function. Refer to your machine's parts manual for exact fitment.