Split ring type insert are used with backing flanges. These are made of Cast iron with asbestos lining. In addition, insert made of suitable composite rubber material for 25 DN to 150DN size. New Non-Asbestos (make Champion, Klinger ) insert are being introduced for 25DN to 300DN.
| CAT.REF. | DN | D | D1 | L | TYPE |
|---|---|---|---|---|---|
| CN0.5 | 12 | 28 | 20 | 8 | A |
| CN0.7 | 15 | 37 | 22 | 8 | A |
| CN1 | 25 | 50 | 34 | 10 | A |
| CN1.5 | 40 | 65 | 48 | 10 | A |
| CN2 | 50 | 80 | 61 | 8 | B |
| CN3 | 80 | 111 | 90 | 9 | B |
| CN4 | 100 | 147 | 119 | 10 | B |
| CN6 | 150 | 195 | 168 | 10 | B |
| CN8 | 200 | 256 | 216 | 8 | B |
| CN9 | 225 | 280 | 240 | 10 | B |
| CN12 | 300 | 361 | 324 | 10 | B |