gas spark plug:genset spark plug industrial spark plug:ignition parts R10P7 engine Jenbacher GS320 series R10P3 engine Jenbacher GS420 series R9B12-77 engine Jenbacher GS620 series Gas type:Natural gas,coal miner gas,landfill gas,biogas R10P7 match wit5 R10P3 match wit7,401824 R9B12-77 match with:436782 Life time:longer than original