Ductile iron manhole cover specifications, models and sizes
Ductile iron manhole covers come in a variety of specifications, models and sizes. Here is a detailed introduction:
Square ductile iron manhole covers:
Common specifications: generally 600mm×600mm, 700mm×700mm, 800mm×800mm, etc.
Common thickness: usually 60mm, 70mm, 80mm, etc.
Applica...