13/17hp tec spark plug. Consistent starts, dependable performance, superior fouling resistance. Replaces Champion model No. RN7YC, N7YC, RN4C, and N4C. Replaces NGK Model No. B5EB, B6EB, B6EB-11, B6EBL-11, B6ES, B6ES-11, B6EV, B6EVX, B7EB, B7EVB-11, B7ES, B7ES-11, BP7ES, BP7ES-11, BR6EB, BR6EB-11, BR6ES, BR6ES-11, BR7EB, BR7EB-11, BR7EIX, BR7ES, BR7ES-11, BUR6EV, and BUR7EB-11. Replaces Autolite model No. 403, 404, 405, and 4056.