Toro OEM Spark Plug
Fits STX-26 Stump Grinder
Thread Size: 14mm
Thread Pitch: 1.25mm
Reach: 19mm(3/4")
Hex Size: 13/16"(21mm)
Gap: .031"(0.8mm)
Fits Toro models but not limted to:
74538, 79549, 22974, 23210, 22972, 22972G, 22973, 22973G, 74549, 79548, 74553, 79553, 23210G, 74536, 74534TE