Product Information

Toyo Double Drainpipes Type JH

Product Information


This product was developed as dedicated pipes for large-diameter rainwater drainage on expressways. It maintains the same high water-tightness as Toyo Drain Ring Pipe.


  • Improved, outstanding water-tightness
    Water-tightness has been improved in comparison with that of conventional sockets.
  • Improved connection strength
    A dedicated socket has been developed and the adhesiveness of the pipe-socket connection improved.
    Water-tightness of the connection is 0.05 Mpa.
  • Low roughness coefficient
    The low flow resistance of the smooth inner walls results in an extremely smooth water flow.
  • High withstanding pressure
    The unique crest-and-trough structure offers high flattening resistance.
  • Corrosion-resistant material
    Polyethylene material is used to provide resistance to corrosion and attacks by a wide range of chemicals, including acids and alkalis.
  • Outstanding workability
    Because the pipes are light and have excellent flexibility, transportation and laying down are easy.
  • Excellent impact resistance
    The use of polyethylene provides superior impact resistance.

Contact Us

Sales Section

Environmental Materials Department
  • It is the customer’s responsibility to always test products before use and confirm their fitness for purpose and safety.
  • Any product contained on this Website or any product using a product contained on this Website should be disposed of in accordance with laws and regulations.
  • Before use, please confirm the detailed method of use, precautions, and other information by using the technical documentation and Material Safety Data Sheet. These materials are available from the relevant Division. Please request them.
  • The information contained in this website is subject to change without notice as new knowledge becomes available.