| Plug Code |
Reference |
| B |
Diameter is 14mm |
| R |
Resistor Plug (Noise Suppression) |
| 9 |
Heat Range (Hot) |
| 10 |
Heat Range (Middle) |
| 11 |
Heat Range (Cold) |
| E |
Reach 19mm (3/4") |
| G |
Fine wire - nickle alloy - center electrode |
| GV |
Gold Palladium- center electrode - Racing use |
| V |
Fine wire - Gold Palladium - Center electrode |
| VX |
High performance Platnium |