Specifications
| size | Ф5X 330mm push type(small valve), Ф10 X 330mm push type(big valve), Ф5 X 330mm spring type, Ф10 X 330mm spring type |
| size | Ф5X 330mm push type(small valve), Ф10 X 330mm push type(big valve), Ф5 X 330mm spring type, Ф10 X 330mm spring type |