| Share | Phrase |
|---|
| 17.07% | reservoir [connection] direct back |
| 16.78% | pump [location] direct back |
| 16.58% | tank [connection] direct back |
| 13.31% | direct back fuel [perform operation] |
| 12.31% | direct back fluid [perform operation] |
| 11.42% | direct back air [perform operation] |
| 6.98% | direct back oil [perform operation] |
| 5.51% | direct back valve [perform operation] |