Крышка трубки
| ASME B16.22 | EN1254-1 |
| GM 5/8 | GM 16 |
| GM 7/8 | GM 22 |
| GM 1 1/8 | GM 28 |
| GM 1 3/8 | GM 35 |
| GM 1 5/8 | GM 42 |
| GM 2 1/8 | GM 54 |
| GM 2 5/8 | GM 67 |
| GM 3 1/8 | GM 76 |
| GM 4 1/8 | GM 105 |
