Manhole cover Features: 1) Product information: Manhole Covers are manufactured for construction and public use. Manhole Covers shall be smooth and free from sand holes, blow holes, distortion or any other defects 2) Material a) Ductile Iron GGG500-7 & 400-12 b) Grey Iron GG203) Designs .a) EN124 A15, B125, C250, D400, E600 and F900 b)..