This is a P3 "Ultra Hot" Turbo Glow Plug from OS Engines.
| Model | Heat Range | Description |
| P5 | Very Hot | For most .18-.28 off-road racing Turbo head engines, especially when the temperature is high or for leaner needle settings and high-nitro/high-rpm running |
| P4 | Super Hot | For most .18-.28 off-road racing Turbo head engines |
| P3 | Ultra Hot | For most .18-.28 off-road racing Turbo head engines |