During conduit routing, when encountering junctions or making turns at wall corners, the middle branch is an external threaded fitting capable of connecting to external components, with both ends featuring double press-fit connections of the same nominal diameter.
| NO. | Size | External Dia.(mm) | Thickness(mm) |
| 1 | 1/2"×R1/2 | 18×1/2 | 1.5 |
| 2 | 3/4"×R1/2 | 22×1/2 | 1.5 |
| 3 | 3/4"×R3/4 | 22×3/4 | 1.5 |
| 4 | 1"×R1/2 | 28×1/2 | 1.5 |
| 5 | 1"×R3/4 | 28×3/4 | 1.5 |
| 6 | 1"×R1 | 28×1 | 1.5 |
| 7 | 1 1/4"×R1/2 | 35×1/2 | 1.5 |
| 8 | 1 1/4"×R3/4 | 35×3/4 | 1.5 |
| 9 | 1 1/4"×R1 | 32.0×1 | 1.5 |
| 10 | 1 1/4"×R1 1/4 | 35×1 1/4 | 1.5 |
| 11 | 1 1/2"×R1/2 | 42×1/2 | 1.5 |
| 12 | 1 1/2"×R3/4` | 42×3/4 | 1.5 |
| 13 | 1 1/2"×R1 | 40.0×1 | 1.5 |
| 14 | 1 1/2"×R1 1/4 | 42×1 1/4 | 1.5 |
| 15 | 1 1/2"×R1 1/2 | 42×1 1/2 | 1.5 |
| 16 | 2"×R1/2 | 54×1/2 | 1.5 |
| 17 | 2"×R3/4 | 54×3/4 | 1.5 |
| 18 | 2"×R1 | 54×1 | 1.5 |
| 19 | 2"×R1 1/4 | 54×1 1/4 | 1.5 |
| 20 | 2"×R1 1/2 | 54×1 1/2 | 1.5 |
| 21 | 2"×R2 | 54×2 | 1.5 |
