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Most access covers tend to be either square or rectangular in shape, and can be hinged for frequent use or designed for lifting out with special lifting keys, and can differ between indoor and outdoor use. Covers are typically available in stainless steel or aluminium, or composite materials, and designed to be a lot more aesthetically pleasing than standard manhole covers and blend in with their surroundings. Recessed access covers especially so, as they can be infilled with many different types of flooring, including bricks, ceramic tiles, concrete and granite to help them really blend in.
A manhole cover is a removable lid that covers the manhole and prevents people and things from falling into it. A manhole cover can be of different shapes like rectangular, square and circle. The most popular choice however is the circular manhole so commonly seen everywhere. Manholes are usually circular and it logically follows to have a circular manhole cover. Circular manhole covers are safe because they will not fall into the manhole where workers may be present.