Before revision: A round manhole and its cover A manhole cover or maintenance hole cover is a removable plate dd forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe.
After revision: A round manhole and its cover A manhole cover or maintenance hole cover is a removable plate forming the lid over the opening of a manhole, an opening large enough for a person to pass through that is used as an access point for an underground vault or pipe.