1. Stable and reliable, with strong pressure-bearing capacity - Material advantages: Ductile iron material features extremely high tensile and compressive strength, excellent impact resistance and corrosion resistance, and can adapt to the complex soil environment and water quality requirements underground in cities. - Flange connection: The all-flange structure has excellent sealing performance, a firm connection, can effectively prevent leakage, reduce water supply loss, and has high stability during long-term use. 2. Flexible adaptation and convenient construction - Diameter change function: It can achieve seamless connection of pipes of different diameters, meeting the diverse requirements of pipe diameter changes in urban water supply networks and reducing the types of accessories. - Efficient installation: The flange structure does not require complex welding. Installation and disassembly can be quickly completed through bolts, which is convenient for later maintenance and expansion, and reduces construction costs. 3. Long-lasting and durable, with low maintenance costs - Anti-aging performance: Ductile iron is resistant to aging and ultraviolet rays, with a long overall service life. It can meet the long-term operation requirements of urban water supply systems and reduce the additional investment caused by frequent replacement. - Strong versatility: It complies with the industry standards of urban water supply projects and can be matched with various ductile iron pipes and valves, suitable for multiple water supply scenarios such as municipal and residential areas.