NGK R6918B-8 (4492) - Standard Spark Plug / Sparkplug. As the main source of power in any petrol engine, a spark plug performs an essential function: It is responsible for igniting the air-fuel mixture in the combustion chamber of petrol engines. This combustion process creates power, ultimately setting the vehicle in motion. NGK Spark Plugs are high quality and have a unique design to guarantee the best possible performance and a wide range of different heat ratings. Specifications: Part Number: R6918B-8, Trade No: R6918B-8, Manufacturer: NGK, Thread Length : 19mm, Outer thread : 14mm, Hex Nut Size : 20.8 mm, Spark projection : 1mm, Connector Type : Fixed SAE, Spec : Platinum Centre Electrode, Spec : Single earthed electrode, Type : interference Suppression 5 kOhm, Gasket Type Seat. Quantity: 1 Unit.