| Share | Phrase |
|---|
| 34.09% | seal for opening/closing |
| 16.24% | opening/closing path [perform operation] |
| 14.82% | opening/closing valve [perform operation] |
| 14.29% | opening/closing passage [perform operation] |
| 7.23% | element [does] opening/closing |
| 7.06% | opening/closing opening [perform operation] |
| 6.24% | valve [does] opening/closing |