The McCormick 6721179A1 is a genuine OEM glow plug designed to provide efficient preheating and reliable cold starting for a wide range of McCormick agricultural tractors. This essential component ensures optimal engine performance in various models, including the C, CX, F, MC, MTX, T, V, X4, X5, X6, and X7 series. With an overall length of 95 mm, a heating element length of 25 mm, a thread diameter of 10 mm, and operating at 11 volts, this glow plug is a direct replacement for part number 67211179A1.