| Material | Aluminum / Rubber |
| O-ring Material | Buna-Nitrile (NBR) |
| O-ring Temperature Range | -35C to 110C |
| Size | KF-40 / NW-40 |
| Nominal Diameter | 40mm |
NW40 centering ring with aluminum body and Buna-Nitrile (NBR) O-ring seal. The NBR O-ring works in temperatures from -35C to 110C and resists oils and acids better than natural rubber. Used for creating vacuum seals between ISO-KF flanges.