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