Product Description The 7306 industrial series spark plug combines over one hundred years of spark plug engineering experience with robust construction of the highest quality heavy duty components. The result is a superior platinum/iridium spark plug which exhibits unsurpassed reliability and an extended service life. Precious metals in both the center and ground electrodes provide exceptional resistance to wear. The highest level of innovation has been applied to every facet of the design and construction of Bosch Industrial Series Spark Plugs. Specifically developed to withstand harsh operating conditions, the Industrial Series is engineered to be the most advanced spark plug on the market. Fits the following engines: Caterpillar G3508, G3512, G3516, G3516B, G3520, G3520C (Biogas only), G3600 Series, Cummins QSV 81G, QSV 91G, QSK 19G, QSK 45G, QSK 60G, QSK 60G, QSK 60G, Guascor FG180, FGLD180, FG240, FGLD240, FGLD360, FGLD480, SFGLD480, Perkins 4000 Series, Superior 1706G2, 1712G1, 2400 G Series, Waukesha AT27GL Series - 13/16" Heads, P48, L36, H24, F18, P9390GL - 13/16 Heads, L7044GSI - 13/16" Heads, 7042GL - 13/16" Heads, L5790GL - 13/16" Heads, F3521GL - 13/16 Heads, L5108GL - 13/16" Heads, L5115GL, F2895GL - 13/16 Heads. brand_description Bosch Automotive