Qingdao Dongfeng Water Supply Equipment Co., Ltd. specializes in manufacturing ductile iron fittings, valves, couplings, flexible adaptors at axles, manhole covers, sorts of special joints and a range of materials and tools, which are used water and sewerage pipeline system, telecommunication, highway, civil engineering, construction and housing fields. Our products are exported to America, England, Japan, Southeast Asia and other countries and regions.Our corporation firstly uses advanced expandable pattern casting (lost foam casting) technology, has built perfectly advanced production lines...