Drainage pit cover:
drainage Pit cover is widely used in the urban road, the square, the botanical garden, the wharf, the airport, the parking lot,
the road ,each kind of industry, the civil project, etc
I--Carrying 20 tons of weight
II—Carrying 14 tons of weight
III---carrying 6 tons of weight
IV---carrying 2 tons of weight
V---Carrying pedestrian weight