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- D- Meaning it has a 12mm thread size and a 18mm hex size
- R- Resistor Type
- 8- Position on heat range from 2-12 (2 hottest, 12 coldest)
- E- 19mm (3/4") thread reach.
- S- Standard 2.5 mm Center Electrode
- L- For this plug the -L means it is a half heat range making it between 8 and 9