... ,B125,C250,D400,E600,F9004)Size as client's requestSand Casting Manhole Cover Material: Grey/Ductile Cast Iron Standard: ISO ... packing or as client's requirement. Dalian Wantong Industrial Equipment Co., Ltd. (WTIE) was established in 1992 as a sub-branch of ... pipes, fittings, know-how and production lines in ductile iron casting fields, Dalian Wantong always believes in the importance of innovation ...