A round metal disc and ring that serve as a the cover to an access point for a human worker to enter a sewer system.
AI Pack: Experimental
◾️ Round manholes in public roads (both the lid and the metal ring)
◾️ Manhole covers on footpath
◾️ Grating covers for storm water access at the side of a road, mostly rectangular in shape
◾️ Maintenance holes and ports that are too small for a human to climb into (some of these are manholes, some are too small: )
◾️ Non-circular manhole covers
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