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Floating cover is different from traditional manhole cover which is fully made of metal. Floating cover has two parts ,the bottom part is a metal ring that heavier than water. And the cover part is made of a special material that lighter than water while reach the strength requirements of manhole cover. And a net is connecting the bottom ring and the light cover.
When flooding ,the cover will floating above the water automatically. While the heavy metal ring remain at bottom. The net connecting the two parts will be stretched up prevent over-size garbages clogging the sewer.