Ductile iron manhole cover 1, From A15 to E600 class 2, Per EN124 ... 3, With new locking system. 4, Various size. Ductile iron manhole cover1, Material :Ductile iron and grey iron, 2,Various size ... has passed ISO 9001:2000 QualitySystem,We can supply various cast iron manhole cover and water grate as your wish..