Champion 404 Copper Plus Resistor Spark Plugs - RN12YC - Box 4

Spark Plug Code: RN12YC

Plug Type: RN12YC.
Seat Type: Gasket.
Hex Size (Inch): 0.813.
Hex Size (MM): 20.65.
Thread Size (Inch): 0.551.
Thread Size (MM): 14.
Thread Reach (Inch): 0.75.
Taper Diameter (Inch): 0.25.
Installed Height: 2.24.
Insulator Projection (Inch): 0.12.
Gap (Inch): 0.032-0.038.
Gap (MM): 0.81-0.97.
Center Electrode Diameter (Inch): 0.1.
Center Electrode Material: Nickel Copper Alloy.
Ground Electrode Material: Nickel Copper Alloy.
Classification: Champion Copper Plus.
Resistor Plug: Y.

Copper Plus spark plug has a copper core center electrode that allows for accurate control of heat range, optimizing performance, and longevity of the spark plug. Patented SAC-9 semi-conductor resistor for maximum EMI and RFI suppression. Patented Ultraseal coated shell for rust prevention.