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18mm Diameter

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18mm Diameter

18mm Diameter spark plugs from popular manufacturers including Bosch, NGK, Champion and Denso.

To find the right spark plug for your vehicle try our Spark Plug Finder

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  1. 10.9mm (0.42") (77)
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  3. 11.6mm (.460") (6)
  4. 12.7mm (1/2") (156)
  5. 13.5mm (0.53") (5)
  6. 16mm (5/8") (2)
  7. 17.5mm (0.708") (1)
  8. 18mm (11/16") (5)
  9. 19mm (3/4") (12)
  10. 20.3mm (0.79") (1)
  11. 20.6mm (0.81") (2)
  12. 25.4mm (1") (3)
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  4. Champion (102)
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About GSP
Green Spark Plug

Green Spark Plug Co. Ltd has now added a dedicated sales and distribution team to handle customers questions and pre-sales enquires, we are experts in our field so if you have a query let us know!

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