Adopt union brass sealing piece, have soft hard sealed effect, make better top sealing performance.

采用一体铜制密封件，形成有效软硬密封效果，使上部密封性能更强。

youdao

Adopt union brass sealing piece, have soft hard sealed effect, make better top sealing performance.

采用一体铜制密封件，形成有效软硬密封效果，使上部密封性能更强。

youdao