Farklı iki çapta borunun birleştirilmesi için kullanılır.
PN 25
| Kod | Ölçü (ø) | ø d1 | E | D | L | Miktar |
| RDS-252000 | 25/20 | 19.5 | 14.5 | 25 | 39 | 500 |
| RDS-322000 | 32/20 | 19.5 | 14.5 | 32 | 39 | 400 |
| RDS-322500 | 32/25 | 24.5 | 16 | 32 | 43 | 300 |
| RDS-402000 | 40/20 | 19.5 | 14.5 | 40 | 39 | 200 |
| RDS-402500 | 40/25 | 24.5 | 16 | 40 | 43 | 200 |
| RDS-403200 | 40/32 | 31.5 | 18 | 40 | 48 | 150 |
| RDS-502500 | 50/25 | 24.5 | 16 | 50 | 43 | 100 |
| RDS-503200 | 50/32 | 31.5 | 18 | 50 | 48 | 100 |
| RDS-504000 | 50/40 | 39.4 | 20.5 | 50 | 52 | 80 |
| RDS-633200 | 63/32 | 31.5 | 18 | 63 | 48 | 60 |
| RDS-634000 | 63/40 | 39.4 | 20.5 | 63 | 52 | 60 |
| RDS-635000 | 63/50 | 49.4 | 23.5 | 63 | 60 | 50 |
| RDS-754000 | 75/40 | 39.4 | 20.5 | 75 | 52 | 40 |
| RDS-755000 | 75/50 | 49.4 | 23.5 | 75 | 60 | 40 |
| RDS-756300 | 75/63 | 62.5 | 27.5 | 75 | 67 | 30 |
| RDS-905000 | 90/50 | 49.4 | 23.5 | 90 | 60 | 20 |
| RDS-906300 | 90/63 | 62.5 | 27.5 | 90 | 67 | 20 |
| RDS-907500 | 90/75 | 74.2 | 31 | 90 | 72 | 16 |
| RDS-116300 | 110/63 | 62.5 | 27.5 | 110 | 67 | 16 |
| RDS-117500 | 110/75 | 74.2 | 31 | 110 | 72 | 16 |
| RDS-119000 | 110/90 | 89.2 | 35.5 | 110 | 90 | 16 |
| RDS-129000 | 125/90 | 89.2 | 35.5 | 125 | 120 | 6 |
| RDS-121100 | 125/110 | 109 | 41.5 | 125 | 120 | 5 |