In light of the small number of covers found on the site, it is quite difficult to characterize the manufacturer’s covers.
Nevertheless, it can be observed that the covers are made of plastic (composite materials) or metal . Their shape is square (or a round cover surrounded by a square frame to facilitate paving around it ) and they are used by the water and gas industries. The standard mark found on the covers is the British BS5834 .
If additional covers are added, the entry will be updated.