Used for connecting pipes and fittings with different nominal diameters at both ends.
| NO. | Diameter/mm | Thickness/ mm |
| 1 | 18×15 | 1.5×1.5 |
| 2 | 22×15 | 1.5×1.5 |
| 3 | 22×18 | 1.5×1.5 |
| 4 | 28×15 | 1.5×1.5 |
| 5 | 28×18 | 1.5×1.5 |
| 6 | 28×22 | 1.5×1.5 |
| 7 | 35×15 | 1.5×1.5 |
| 8 | 35×18 | 1.5×1.5 |
| 9 | 35×22 | 1.5×1.5 |
| 10 | 35×28 | 1.5×1.5 |
| 11 | 42×15 | 1.5×1.5 |
| 12 | 42×18 | 1.5×1.5 |
| 13 | 42×22 | 1.5×1.5 |
| 14 | 42×28 | 1.5×1.5 |
| 15 | 42×35 | 1.5×1.5 |
| 16 | 54×15 | 1.5×1.5 |
| 17 | 54×18 | 1.5×1.5 |
| 18 | 54×22 | 1.5×1.5 |
| 19 | 54×28 | 1.5×1.5 |
| 20 | 54×35 | 1.5×1.5 |
| 21 | 54×42 | 1.5×1.5 |
| 22 | 76.1×42 | 2.0×1.5 |
| 23 | 76.1×54 | 2.0×1.5 |
| 24 | 88.9×54 | 2.0×1.5 |
| 25 | 88.9×76.1 | 2.0×2.0 |
| 26 | 108×54 | 2.0×1.5 |
| 27 | 108×76.1 | 2.0×2.0 |
