1.Hot-dip galvanized steel grid plate: hot-dip zinc surface treatment makes it have good anti-corrosion ability, and the surface luster is beautiful; Good ventilation, lighting, heat dissipation, ...
The well cover is also called "ditch cover", "manhole cover", "ditch cover", "the manhole cover was originally made of cement, and it is easily damaged in the normal use of the middle ditch. Later...