Compare Maximum number of 4 items selected Champion Industrial Plug Number D9 Spark Plug - 509 Part #: 509 Line: CHP Champion Industrial Plug Number D9 Spark Plug 1 Year Limited Warranty Metallurgy: Copper Service Number: D9 Center Electrode Tip Material: Nickel Ground Electrode Tip Material: Nickel Heat Range: 9 Thread Reach (in): 0.500 Inch Seat: Gasket Hex Size (mm): 22mm Hex Size (in): 7/8 Inch Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.64mm Show More Show Less