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This is the P7 "Medium" Turbo Glow Plug for use in the OS Max .21 VZ-R, V-Spec, .12 TR and .18 TZ/TM and other O.S. Turbo head engines.
See the O.S. Turbo glow plug chart below to compare the different Turbo glow plugs available for O.S. engines:
| Model | Heat Range | Description |
| P8 | Cold | Cold enough to outlast the hottest "heats". For Turbo head engines. |
| P7 | Medium | An all-season, medium-heat plug for Turbo head engines. |
| P6 | Hot | A hot choice for all .12-.21 Turbo head engines. |
| P3 | Ultra Hot | An ultra-hot plug for the 18TZ, V-Spec and other Turbo head engines. |