Can be freely adjusted in the same nominal diameter of the pipe, mainly used in the pipeline wiring, due to the pipeline length or short of the calculation error caused by the non-availability of equal diameter direct problem, or in the maintenance of the use of.
| NO. | Diameter/mm | Thickness/ mm |
| 1 | 15 | 1.5 |
| 2 | 18 | 1.5 |
| 3 | 22 | 1.5 |
| 4 | 28 | 1.5 |
| 5 | 35 | 1.5 |
| 6 | 42 | 1.5 |
| 7 | 54 | 1.5 |
| 8 | 76.1 | 2 |
| 9 | 88.9 | 2 |
| 10 | 108 | 2 |
