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Direct- Passage Polythene Manhole

For inlets up to 600 mm, direct-passage polyethylene manhole with diameter 1000 mm is used. For sizes of 800 mm and sometimes 1000 mm, shafts of 1200 mm and 1400 mm are also used. But it's better for size 1000 mm or bigger one to use a side-passage manhole.

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