|
|
| Share | Phrase |
|---|
| 27.51% | prevent back-flow [perform operation] |
| 18.94% | back-flow valve |
| 9.86% | fluid back-flow |
| 9.23% | back-flow zone |
| 7.91% | ensure back-flow [perform operation] |
| 7.24% | oil back-flow |
| 6.55% | fuel back-flow |
| 6.12% | gas back-flow |
| 4.08% | air back-flow |
| 2.52% | not back-flow |
|
|