The John Deere MIU12354 is a genuine OEM spark plug engineered for reliable ignition and efficient engine performance across numerous John Deere equipment models. This high-quality spark plug is suitable for various 100, 200, 300, 400, X300, X500 series lawn tractors, ZTrak mowers, QuikTrak mowers, Commercial Walk-Behind Mowers, and Gator utility vehicles. It replaces OEM part numbers MIU11020, M802138, and M802139, and is cross-referenced with aftermarket brands like NGK BPR4ES and Champion RC12YC.