Іt is used to connect horizontal and vertical chimney.
D - any diameter of standard sizes larger than the diameter of the insert.
| Di, mm | L, mm | H, mm | D, mm |
| 350 | 100 | 550 | 350 |
| 400 | 100 | 600 | 400 |
| 450 | 100 | 650 | 450 |
| 500 | 100 | 700 | 500 |
| 550 | 100 | 750 | 550 |
| 600 | 125 | 800 | 600 |
| 650 | 125 | 900 | 650 |
| 700 | 125 | 950 | 700 |
| 750 | 125 | 1000 | 750 |
| 800 | 125 | 1050 | 800 |
| 900 | 125 | 1150 | 900 |
| 1000 | 175 | 1350 | 1000 |