... Ductile iron manhole cover 1)ductile iron QT400/18,QT450/10,QT500/7,QT600/3,QT700/2 Grey iron:HT150,HT200,HT250,D400,E600,F9 Ductile iron manhole cover 1)ductile iron ... series include Class B125, C250, D400, E600, F900 meeting the relevant EN124, BVQI and Australian standards 4) Form ... 1200mm 5) Certificate of Approval: BVQI, LRQA, EN124 Packing: Iron or wooden pallet 5) Certificate of Approval:BVQI, ...