Pin to pin design improves ignitability of air fuel mixture, improving efficiency. 2.4mm high content iridium center and ground electrodes for long life even in biogas/landfill applications. Continuous laser welding ensures precious metal stays in place. Extra material in thread area helps control shell deformation under torque while specially engineered crush washer offers high torque retention. Nickel plated threads reduce likelihood of seizing. Longer graphite-metal glass resistor provides consistent resistive value for EIS equipped engines. Gas tight seal prevents blow by of combustion gasses. Full length threaded and crimped brass terminal nut provides maximum strength and secure vibration free connection to ignition leads.