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Cover EN124 D400 Cast Iron Double Sealed Triangular Ductile Iron Manhole Cover and Frame Heavy Duty Sand Cast Ductile Iron Double Triangular Manhole in Drainage, Building & Municipal Products & Services! Until now, we get the.Square manhole cover and frame Specification: 1/,Metarial:Ductile iron. 2/,Standard:A15,B125,C250, D400,E600,F900 as per EN124. 3/,Type:round,square,rectangular. 4/,Certificate:ISO9001:2008,SGS,BV. 5/,We have our own moulds,also. JONGHAP MANHOLE STEEL IND. JINWON Development Co.,Ltd JINHAENG WATERWAY CO., LTD. CHUNG SOO METER ChungJungTech. co. Ltd,Ltd PPI PIPE SYSTEM VIET WATER Knowledge Trial Guide and Public Relations Office (Patent Office) Polling station E-2-5 E-3