产品尺寸
| SIZE | φ | A | B | D | E |
| 3/4″ | 19.05 | 50.5 | 43.5 | 16.5 | 21.0 |
| 1″ | 25.4 | 50.50 | 43.5 | 22.4 | 21.0 |
| 1¼″ | 31.8 | 50.5 | 43.5 | 28.8 | 21.0 |
| 1½″ | 38.1 | 50.5 | 43.5 | 35.1 | 21.0 |
| 2″ | 50.8 | 64 | 56.5 | 47.8 | 21.0 |
| 2½″ | 63.5 | 77.5 | 70.5 | 59.5 | 21.0 |
| 3″ | 76.3 | 91 | 83.5 | 72.3 | 21.0 |
| 3½″ | 89.1 | 106 | 97 | 85.1 | 21.0 |
| 4″ | 101.6 | 119 | 110 | 97.6 | 21.0 |
工业标准有：ISO、DIN、IDF、3A 等。
