Still not sure? Click the image below to open a printable page (Adobe PDF) and compare your existing gasket or fitting to the images representing each size.
| Sanitary Size |
OD of Clamp End |
ID of Fitting |
| 1/2" |
0.992 |
0.370 |
| 3/4 |
0.992 |
0.620 |
| 1.0" |
1.984 |
0.870 |
| 1.5" |
1.984 |
1.320 |
| 2.0" |
2.516 |
1.870 |
| 2.5" |
3.047 |
2.370 |
| 3.0" |
3.579 |
2.870 |
| 4.0" |
4.682 |
3.834 |
| 6.0" |
6.562 |
5.782 |
| 8.0" |
8.602 |
7.760 |
| 10.0" |
10.57 |
9.782 |
| 12.0" |
12.57 |
11.760 |
Related: National Pipe Size - DN Conversion Chart