Denso GK3-7
The Denso GK3-7 spark plug is designed specifically for the Cummins ISL-G and ISB-G compressed natural gas (CNG) engine. The spark plug GK3-7 is also available in an aftermarket kit with a rubber boot or with a rubber cable.
The GK3-7 is equivalent to the original Cummins IR-3 plug.
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