Applications: irrigation plants. Available in several sizes, they can be used in large plants, meant to public parks and gardens, commercial zones and sports areas, as well as in small plants, meant to private use. Purpose: installation and protection of underground irrigation plants. They are particularly apt to protect hand intakes, valves, shutoff valves, etc. Notes: made in non-toxic and recyclabe polypropylene engineering resin engeneering , they are inert compared to other substances of the soil. Their high mechanical resistance,makes them absolutely safe in case of pedestrian and grass-sweepers traffic. The antiskid and ultraviolet-protected covers have an hexagonal design.