没有橡胶密封垫圈的孔堵塞，一旦你敲出来的，所以它不是气象证明。
There is no rubber grommet to seal the hole once you knock the plug out, so it is not weather proof.
密封的弹性使得阀门阀体和阀瓣能够接触或扩张，避免了由于温度波动而产生堵塞的危险。
The resiliency of the seal allows the valve body and disc to contract or expand, without the risk of jamming due to temperature fluctuations.
该工具然后绘制朝头部成员扩大锚安全的连接密封堵塞的管道和衬垫。
The tool then draws the expanded anchoring member towards to the head to securely connect the seal plug to the pipeline and liner.
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