Rubber ring (packing for water supply and sewage)

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About Rubber ring (packing for water supply and sewage)

This rubber ring is used as a vibration-resistant coupling for ductile pipes. Because there is a certain amount of space between pipes, its structure allows it to stretch, contract, and bend in response to the tectonic shifting of earthquakes.
INOAC is a member of the Japan Ductile Iron Pipe Association and the Rubber Ring Association, and has engaged in manufacturing and sale of its products for half a century.
In response to the Great Hanshin-Awaji Earthquake, INOAC developed a rubber ring having a new vibration-resistant pipe structure to serve as a countermeasure against earthquakes.


  • Durability

    A half-century track record of production and construction as well as research and development as a member of the Rubber Ring Association’s Technical Committee resulted in the development of superior durability and resistance to long-term degradation.
    We have prescribed a compound that thoroughly takes into consideration the durability and resistance to long-term degradation of rubber rings.

  • Lineup

    We manufacture and sell a variety of types of rubber ring, ranging from ductile iron pipes for water supply, to application in sewage pipes and agricultural water pipes, etc.
    We also offer new vibration-resistant pipe structure rubber rings that provide peace of mind even in Japan with its many earthquakes.

  • Size

    A variety of sizes are available, from small apertures of 20 or 30 centimeters to large apertures of a few meters, including die molding, extrusion, joining, and feed molding.
    In addition, lock rings and other peripheral components for rubber rings are also available.

  • Safety for drinking water

    A specialized compound that ensures safety is utilized in the rubber used as water supply packing that comes into direct contact with drinking water.


  • Rubber ring (Packing for water supply and sewage)

  • Rubber ring (Packing for water supply and sewage)