Stem the screw on the rear always fill in, to prevent the movement with filler.

阀杆的螺纹尾部始终在填料之上，防止运动时带出填料。

youdao

Stem the screw on the rear always fill in, to prevent the movement with filler.

阀杆的螺纹尾部始终在填料之上，防止运动时带出填料。

youdao