The connection method of ductile iron pipes is highly flexible. Regardless of the inner or outer diameter, as long as the nominal diameter is the same, they can be interconnected. Moreover, the pipe size can be adjusted using matching fittings. The outer diameter of the ductile iron pipe is the same as that of steel pipes and PE pipes, so they can be connected during construction using flange bolts. If connecting PE pipes to ductile iron pipes requires a thermal melting process, flanges are also used. The accessories for ductile iron pipes are comprehensive, allowing for size adjustments, and can be connected to galvanized pipes using thread connections. The variety of accessories ensures quick and convenient installation.