For pipe wiring, when encountering nodes or turning corners in the wall, the middle branch pipe is a male/female/external threaded fitting that can be connected to external parts, and the two ends are M profile press fittings with the same nominal diameter.
| NO. | Diameter/mm | Thickness/ mm |
| 1 | 15×1/2" | 1.5 |
| 2 | 15×3/4" | 1.5 |
| 3 | 18×1/2" | 1.5 |
| 4 | 18×3/4" | 1.5 |
| 5 | 22×1/2" | 1.5 |
| 6 | 22×3/4" | 1.5 |
| 7 | 28×1/2" | 1.5 |
| 8 | 28×3/4" | 1.5 |
| 9 | 28×1 | 1.5 |
| 10 | 35×1/2" | 1.5 |
| 11 | 35×3/4" | 1.5 |
| 12 | 32.0×1 | 1.5 |
| 13 | 35×11/4" | 1.5 |
| 14 | 42×1/2" | 1.5 |
| 15 | 42×3/4" | 1.5 |
| 16 | 42×1 | 1.5 |
| 17 | 42×11/4" | 1.5 |
| 18 | 42×11/2" | 1.5 |
| 19 | 54×1/2" | 1.5 |
| 20 | 54×3/4" | 1.5 |
| 21 | 54×1 | 1.5 |
| 22 | 54×11/4" | 1.5 |
| 23 | 54×11/2" | 1.5 |
| 24 | 54×2 | 1.5 |
