Non-Return Flap Valve Chambers

Non-Return Flap Valve Chambers are designed to stop the backflow of sewage, foul water and rainwater.

With over 2 million properties at risk from flooding in the UK, the Marshalls Civils & Drainage precast concrete chamber design includes a pre-fitted non-return flap valve installed in either a 1200mm, 1500mm, 1800mm or 2100mm diameter one-piece concrete chamber or a 2000mm, 2100mm, 2400mm, 2700mm or a 3000mm sectional chamber system.

The one-piece chamber is fabricated using a base unit complying BS EN 1917:2002.

Benefits include:

  • Precast chamber not subject to floatation.
  • Offsite solution manufactured under factory conditions.
  • Advice available for precast concrete chamber design, specification and installation.
  • A low maintenance proven solution.



01179 814500

Certification Logos and Accreditations

  • Accreditation ISO 9001 Logo
  • Accreditation ISO14001 Logo