Functional advantages of plastic inspection wells. (1) resistant to acid and alkali corrosion, aging and long service life. (2) Safety and environmental protection. (3) uniform settlement and compression. (4) the construction is convenient and fast. (5) efficient drainage. (6) Light weight, easy to transport and install, reliable performance and strong bearing capacity. (7) the comprehensive cost is low, the maintenance cost is low, and it can be recycled. (8) good sealing performance and anti-leakage. (9) Saving materials