A Cork valve is a kind of valve, also known as a plug valve. Mainly used in the filter, low-pressure boilers, media pipeline pressure gauge to take the pressure pipe, the other rarely used.
| DN | NB | Inner diameter of thread（mm） | Outside diameter of thread（mm） |
| DN6 | 1/8 | 8.5 | 9.5 |
| DN8 | 1/4 | 11.5 | 12.5 |
| DN10 | 3/8 | 15 | 16 |
| DN15 | 1/2 | 19 | 20 |
| DN20 | 3/4 | 24 | 25.5 |
| DN25 | 1 | 30 | 32 |
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