Champion RHM78PP

Thread size: M18
Thread reach: 1/2"
Hexa size: 7/8"
Ground electrode: Ni (4x)
Cetre electrode: Ni
Finish: Unshielded
Heat ragen: Cold
Application: varies, please call.

The following engine manufacturers widely use this spark plug:

Climax, Cooper-Bessemer, Dorman, Fairbanks Morse, John Deer, MEP Industries, Minneapolis-Moline, Rathbun Jones, Roiline, Superior, Waukesha