Champion Iridium Plug Number RES12WYPB4 Spark Plug - 9300 Part #: 9300 Line: CHP Champion Iridium Plug Number RES12WYPB4 Spark Plug 2 Year LIMITED WARRANTY Seat: Tapered Thread Size: M14 Heat Range: 12 Hex Size (in): 5/8 Inch Thread Reach (in): 1 Inch Center Electrode Tip Material: Iridium Ground Electrode Tip Material: Platinum Service Number: RES12WYPB4 Metallurgy: Iridium/Platinum Show More Show Less