As you can choose the cover's surface, you can make the BG manhole cover completely disappear from sight by using paving stones, concrete, natural stone, tiles, grass, plants, etc. All that remains is the dirt collection edge. Rusty cast iron covers or ugly concrete covers are past.
Thanks to the 10 mm dirt collection edge, it is guaranteed that no dirt can collect under the cover and that it can still be opened even after several years without any problems. To ensure easy removal, the troughs and frames are conically-shaped.