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- D- Meaning it has a 12mm thread size and a 18mm hex size
- P- Projected insulator type
- R- Resistor Type
- 7- Position on heat range from 2-12 (2 hottest, 12 coldest)
- E- 19mm (3/4") thread reach.
- A- Special Design
- 9- Here the 9 means it has a 0.9mm Gap or .036"