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I will surmise that because the " riser ".., the " Donut".., and all the pipes that the manhole gives access to.., are round.
Besides, when the cover needs to be lifted, a round one will allow easier removal than any other shape.
When you put any other shape on edge, the circle affords the least perimeter area in contact with the hole.., thus allowing the easiest removal.
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30 years in construction
12 years ago. Rating: 11 | |
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