The Denso GK3-7 Iridium Saver DDI spark plug is designed specifically for the Cummins ISL-G compressed natural gas (CNG) engine. These unique spark plugs include two side ground electrodes which help block the very rapid gas flow at the spark plug, allowing the proper spark to be generated.
Spark Plug and Optional Boot Kit
C Gas Plus
Part Number: 674-2000
1 x Iridium 3-Prong Spark Plug (Part number: GK3-7#4)
1 x Spark Plug Boot (Part number: 674-1000)
1 x Dielectric Grease