Farklı iki çapta borunun birleştirilmesi için kullanılır.
PN 25
| Kod | Ölçü (ø) | ø d1 | ø d2 | E1 | E2 | L | Miktar |
| RDM-252000 | 25/20 | 24.5 | 19.5 | 16 | 14.5 | 35 | 400 |
| RDM-322000 | 32/20 | 31.5 | 19.5 | 18 | 14.5 | 38 | 300 |
| RDM-322500 | 32/25 | 31.5 | 24.5 | 18 | 16 | 40 | 250 |
| RDM-402000 | 40/20 | 39.4 | 19.5 | 20.5 | 14.5 | 47 | 150 |
| RDM-402500 | 40/25 | 39.4 | 24.5 | 20.5 | 16 | 47 | 150 |
| RDM-403200 | 40/32 | 39.4 | 31.5 | 20.5 | 18 | 47 | 125 |
| RDM-502000 | 50/20 | 49.4 | 19.5 | 23.5 | 14.5 | 50 | 100 |
| RDM-502500 | 50/25 | 49.4 | 24.5 | 23.5 | 16 | 50 | 100 |
| RDM-503200 | 50/32 | 49.4 | 31.5 | 23.5 | 18 | 50 | 80 |
| RDM-504000 | 50/40 | 49.4 | 39.4 | 23.5 | 20.5 | 50 | 75 |
| RDM-632000 | 63/20 | 62.5 | 19.5 | 27.5 | 14.5 | 60 | 40 |
| RDM-632500 | 63/25 | 62.5 | 24.5 | 27.5 | 16 | 60 | 40 |
| RDM-633200 | 63/32 | 62.5 | 31.5 | 27.5 | 18 | 60 | 40 |
| RDM-634000 | 63/40 | 62.5 | 39.4 | 27.5 | 20.5 | 65 | 40 |
| RDM-635000 | 63/50 | 62.5 | 49.4 | 27.5 | 23.5 | 66 | 35 |