Sewages lead rainwater and waste water from houses, buildings and factories to processing plants. Pipes of excellent hydraulic properties, water tightness, durability and corrosion resistance have been developed as well as a large-scale manhole for inspection and maintenance.

This is a polyvinyl chloride drain pipe with a circular rib on the outer circumference that is formed by a special molding technique.
It is a high-performance pipe with about 2/3 the weight of conventional polyvinyl chloride pipes and with double the rigidity.
Ribbed Simple Manholes are also available. A totally ribbed and highly earthquake-proof line configuation is possible.

This is a compact manhole of Φ300 that offers ease of inspection, maintenance and management equivalent to man holes of Φ900. It assists in simplifying labor and reducing the costs.