The drainage manholes are made using a single-shot molding process, offering several advantages over traditional brick-lined wells:

(1) The drainage and sewage manholes can be directly applied during project construction, featuring simple installation and rapid construction speed. The ratio of construction volume between the manholes and the same-time period work is approximately 20:1, significantly reducing the labor cost compared to brick-lined wells and traditional manholes. Brick-lined wells require manual on-site construction and are susceptible to weather conditions. Therefore, using drainage and sewage manholes can greatly shorten the construction timeline.

(2) The drainage and sewage inspection wells have strong corrosion resistance and sealing properties. Generally, high-performance composite materials are used, ensuring no leakage occurs. Conversely, brick-lined wells are prone to water leakage.

(3) The inner walls of the drainage and sewage manhole pipes are smooth and unobstructed, making them very easy to clean, and the regular maintenance costs are relatively low for the sewage four-way junction manholes.

(4) The drainage and sewage manholes are made of a new high polymer material, offering a longer service life, typically over 50 years, whereas brick-lined manholes have a lifespan of about ten years.