Material A) Ductile Iron B) Grey Iron 1) Product information: Manhole covers are manufactured for road construction, natural gas, water supply and drainage, telecommunications. Manhole covers and gratings should be smooth, no blisters, holes, distortion or any other defects. 2) Material A) Ductile Iron GGG500-7, GGG 400-12, GGG600-3, GGG700-2 B) Grey Iron GG20, 25, 30, 35 3) Designs A) EN124 A15, ...