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