... Standard: EN124 Diameter: 300-1800mmMaterials: Various Grade Cast iron and Grey Cast Iron: - Grey Cast Iron Types: GG15 ,GG20, GG23, GG25 ,GG30 - Ductile ... Manhole Covers are manufactured for construction and public use. Manhole Covers shall be smooth and free from sand holes, blow holes ... 2) Designs .a) EN124 A15, B125, C250, D400, E600 and F900 b) A60005 for casting design c) Major standards designs ...