A drop connection manhole is one that is positioned where a sudden drop in the elevation of pipelines occurs. The incoming pipe – the influent line – is higher than the outgoing pipe – the effluent pipe. The change in elevation of the pipelines may occur before the manhole (which is then known as an external drop connection manhole) or inside the manhole (which is then known as an internal drop connection manhole).
虽然EPA的MARHOLES和下水道系统的通用代码指定了内部下降连接索霍尔不是最佳选择，但许多城市仍然具有所谓的名称在他们的井中的“海狸滑动”连接。“海狸幻灯片”是指低角度的河岸，海狸可以滑下来进入相邻的河流。这种类型的连接类似于海狸滑块，因为它是在地幔内发生的流水管道和流出管之间的低角度连接。这使得这些人孔默认成为内部掉线连接人孔。
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