The NGK Y1021J is a high-quality 11V glow plug designed for reliable cold starting in various agricultural and industrial diesel engines. Featuring an M10x1.25 thread, 71mm overall length, and a 25mm heating rod, this glow plug ensures efficient pre-heating. It is a direct replacement for OEM part numbers including John Deere CH19846, Kubota 15331-65510, Caterpillar 115-4100, and Yanmar 129150-77801, fitting a wide range of compact tractors and utility vehicles.