Champion Industrial Plug Number D14 Spark Plug - 514 Part #: 514 Line: CHP Champion Industrial Plug Number D14 Spark Plug 1 Year Limited Warranty Seat: Gasket Thread Size: M18 Heat Range: 14 Hex Size (mm): 22mm Hex Size (in): 7/8 Inch Preset Gap (in): 0.025 Inch Preset Gap (mm): 0.65mm Thread Reach (in): 0.500 Inch Center Electrode Tip Material: Nickel Ground Electrode Tip Material: Nickel Service Number: D14 Metallurgy: Copper Show More Show Less