NGK Spark Plug,13/16& Hex Sz,0.551& Thread

Spark Plug; Application Marine; Powersports; Hex Size 13/16 in; Thread Size 0.551 in; Thread Reach 0.75 in; Ground Electrode Quantity 1; Ground Electrode Tip Design Standard; Gap Size 0.031 in; Resistor Plug Yes; Hex Size - Metric 20.64 mm; Thread Reach - Metric 19.05 mm; Insulator Material Ceramic; Manufacturer Heat Range 8; Seat Type Flat; Center Electrode Diameter 0.098 in; Ground Electrode Material Nickel Core; Center Electrode Material Nickel