Anti-Backflow Valves

Prevents flooding as a result of sewer backflow.

We manufacture three ranges of anti-flood backflow valve suitable for residential and domestic applications.

  • ACO Junior is a Type 5 passive anti-flooding device for grey water applications.
  • ACO Quatrix is a Type 3 passive anti-flooding device for grey or black water applications. Available with and without chamber, it is suitable for black water applications.
  • ACO Triplex is suitable for grey water applications and is an in-line Type 2 passive anti-flooding device. ACO Triplex has no access chamber.


  • All parts are removable for easy cleaning and parts replacement
  • All products conform with BN EN 13564 for either grey or black water applications.
  • Designs suitable for use in a variety of domestic and residential applications


  • Reliable and durable
  • Suitable for housing which is built on flood plans and other areas prone to flooding
  • Suitable for use in residential applications with basements and below-ground living space

Recommended Applications

  • Domestic housing
  • Residential developments
  • Domestic refurbishment projects

Not Recommended Applications

  • Commercial and industrial applications

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