Refers to municipal roads under municipal drain rainwater, sewage pipes, commonly known as "water pipe" in engineering often called municipal sewer. According to China under the municipal road facilities situation, generally set with different pipelines, such as electricity, telecommunications, gas, water supply, drainage and so on. The drains on account of rain and sewage diversion measures, namely rain generally discharged into nearby rivers, sewage discharged into the sewage treatment plant, so the municipal stormwater and sewage pipes including two kinds of pipes. Features: http://www.hbyubengy.com l, chemical stability, non-aging, and its intensity increases with time extension. 2, corrosion resistance, not magnetized. 3, impermeability performance, test pressure 0.8MPa. 4, the axial compressive strength of 145MPa. 5, inexpensive, and easy construction.