Spark Plug Premium Lawn And Garden Spark Plug; Resistor; 5/8 in. Hex Size; 0.750 in. Thread Reach; 14mm Thread Diameter; Gasket Seat; DiamondFIRE Tip w/Adjustable Gap; FEATURES: Patented DiamondFIRE Ground Electrode Edge-To-Edge Ground Electrode Out Performs Other Plug Designs E3 Equipped Engines Can Minimize Venting Of Unburned Fuel Burn Fuel More Efficiently By Burning Fuel More Completely Provide A Like-New Performance For The Life Of The Plug The Most Environmentally-Friendly Plug Available E3.20 is a 14mm 0.750 in. reach plug with a gasket seat. It is used in a variety of four cycle overhead value small engine applications. The patented DiamondFIRE side wire is proven to increase power reduce fuel consumption and improve hydrocarbon emissions in long-term use. The unique ground electrode and full-size center electrode also provides optimal performance over an extended product life. Our company was formed to find a better design that would provide E3 customers with performance advantages such as increased power improved fuel efficiency and a reduction in hazardous engine emissions that can contribute to global warming. With decades of experience in spark plug engineering and the automotive aftermarket the principals of E3 Spark Plugs realized that the key to producing a better spark plug did not lie in the use of fancy metals such as iridium or platinum. Instead it would require an entirely new approach in the design of the plug s electrode to improve the ignition of raw fuel inside the engine s combustion area. The first step would be to get rid of the antiquated J-wire electrode. This would allow the flame kernel to move directly toward the unburned air/fuel mixture. E3 s initial research started in its own laboratories and led to the testing of new designs at two leading engineering universities. After investing in years of research and assisted by top professors in the field of combustion and engine dynamics the DiamondFire ground electrode was developed as a better way to ignite the fuel-air mixture inside the engine s cylinder. Since this advanced design increased the combustion pressure inside the engine before raw fuel was exhausted they had discovered a better way to control the burn. A faster flame speed and improvements in directing the spark inside the combustion area resulted in a marked (and proven) increase in power output fuel efficiency and reduced emissions for gasoline-powered engines. These results were validated using the some of the most sophisticated testing equipment available. Over and over again the new plug burned fuel more efficiently improved power response and cut toxic emissions. Today E3 remains dedicated to reducing greenhouse gas emissions by limiting the amount of unburned fuel.