Reducing Coupling Stainless Steel Grooved Fittings are used to connect grooved pipe materials with different nominal diameters at each end.
| NO. | Size | External Dia.(mm) |
| 1 | 6''×125 | 159.0×133.0 |
| 2 | 8''×5'' | 219.0×133.0 |
| 3 | 8''×150 | 219.0×159.0 |
| 4 | 10''×5'' | 273.0×133.0 |
| 5 | 10''×150 | 273.0×159.0 |
| 6 | 10''×200 | 273.0×219.0 |
| 7 | 12''×5'' | 325.0×133.0 |
| 8 | 12''×6'' | 325.0×159.0 |
| 9 | 12''×8'' | 325.0×219.0 |
| 10 | 12''×10'' | 325.0×273.0 |
