Weldable surfaces – female/male. The coupling is designed for cases where the transition from one pipe diameter to another is made through a fitting, such as a polypropylene corner or a tee.
| Size, mm | Article | D | D1 | d | L | L1 | H | pcs/boxes |
| 25×20 | K0056.PRO | 29 | 25,2 | 16,2 | 15 | 15 | 34,5 | 1200 |
| 32×20 | K0057.PRO | 32,3 | 29,2 | 19,2 | 17 | 17 | 39 | 720 |
| 32×25 | K0058.PRO | 36,1 | 32,3 | 21,5 | 17,5 | 17 | 40 | 660 |