Waste draining pipe, offlet or drain pipe should be connected to the main pipe; each pipe should connect two valves with the most possible short valve-to-valve pipe length.

排污管、放水管或疏水管应分别连接到各自的总管上，每管均应串接两个阀门，两阀门间的管段应尽量缩短。

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The invention provides a drain pipe comprising a main pipe, wherein installing parts are arranged at both ends of the main pipe and a spiral rib is arranged on the pipe wall of the main pipe.

本发明提供一种排水管。所述排水管包括一个主管，所述主管两端设有安装部，所述主管的管壁上设有螺旋筋。

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