The street inlet cover is a product used in external sewage systems as a road drain cover. This product is made of steel-reinforced polymer concrete and the top is finished in such a way as to ensure a non-slip surface.
After installing the cover on the street inlet, no metal elements are visible reducing the risk of theft and resale. This product is D400 certified.
More details can be found at: https://sytec.pl/en/prod/street-inlet-covers/kp-class-d400-i21.