Marine Spark Plug; Resistor Plug; Nickel Copper Alloy; 0.551 Inch Thread Diameter; 0.441 Inch Thread Reach; Tapered Seat; Gap Range 0.032 - 0.038 Inch; Plug Type RV91MC; Single
Marine Spark Plug; Resistor Plug; Nickel Copper Alloy; 0.551 Inch Thread Diameter; 1/2 Inch Thread Reach; Gasket Seat; Gap Range 0.027 - 0.033 Inch; Plug Type QL86C; Single