n. water-stop
就像是定期洒水头，艰难的期待防水密封塑料外壳拥有多个密钥。
It looks like a regular sprinkler head and the tough water-tight plastic case holds multiple keys.
防尘盖封闭，锁存，通过连接器接口具有IP65防护等级，从而提供了一个水密封口。
With the dust cover closed and latched, the through connector interface has an IP65 rating thereby providing a watertight seal.
疏水密封箱具有对凝结水收集和排放功能。这些凝结水在极可能在烟道部分区域里形成危险。
The drain seal boxes are provided for the collection and drainage of condensates, which may form in endangered section of the flue gas ducts.
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