;)
Two types of inserts are used depending upon the type of buttress ends and the backing flange.
1. Type A : For tapered buttress ends, asbestos gasket arcs are used for fitting between the tapered end and the flange.
2. Type B : For collared buttress ends, Cast iron split rings with thin asbestos rope are used & as backing rings between collar and the flange.
| CAT. REF. | DN | D | D1 | L |
|
| GCNB 25 | 25 | 50 | 32 | 10 | |
| GCNB 40 | 40 | 65 | 48 | 10 | |
| GCNB 50 | 50 | 80 | 60 | 10 | |
| GCNB 80 | 80 | 110 | 88 | 11 | |
| GCNB 100 | 100 | 146 | 117 | 14 | |
| GCNB 150 | 150 | 195 | 165 | 14 | |
| GCNB 225 | 225 | 280 | 240 | 10 | |
| GCNB 300 | 300 | 361 | 324 | 10 | |
| GCNB 450 | 450 | 555 | 480 | 18 | |
| GCNB 600 | 600 | 684 | 642 | 10 |
