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About product and suppliers:
        Alibaba.com offers 3,791 heavy duty ductile iron manhole cover products. About 43% of these are casting, 33% are other fabrication services. 

A wide variety of heavy duty ductile iron manhole cover options are available to you, such as free samples, paid samples. 

There are 3,790 heavy duty ductile iron manhole cover suppliers, mainly located in Asia. The top supplying countries or regions are China, Vietnam, and Turkey, which supply 98%, 1%, and 1% of heavy duty ductile iron manhole cover respectively. 

Heavy duty ductile iron manhole cover products are most popular in Eastern Europe, North America, and Africa. 

You can ensure product safety by selecting from certified suppliers, including 1,477 with ISO9001, 1,016 with ISO14001, and 253 with Other certification.