Foul and Surface Water Drainage System

Watch the Osma UltraRib overview video

Osma UltraRib has been designed and manufactured to exceed all required industry standards for PVC-U systems, OSMA UltraRib has provided foul and surface water solutions that have been relied upon for over 30 years.

Strength in every rib!

tick Unique ribbed design for exceptional axial rigidity and radial strength.
tick The UK’s only single walled ribbed system.
tick Tried, tested and trusted for over 30 years.

Quality assured

tick Fully approved to BS EN 13476-3 and WIS 4-35-01.
tick BBA approved fittings.
tick Approved by Water Companies.
tick Meets requirements of Sewers for Adoption 6th, 6a & 7th editions.

Pipe Deformation Tool

Use our handy on-line tool to instantly calculate the deformation rate for Osma UltraRib pipe.

Use the tool


Osma UltraRib pipes

- Available in 150, 225 and 300mm diameters.
- Stiffness class SDR34 (SN8).
- Available in 3m and 6m lengths, either in plain ended or socketed
  (300mm available in 3m lengths only).

See the range

Osma UltraRib fittings

- Comprehensive range of fittings.
- Unique high performance joint.

See the range

Osma UltraRib chambers

- Range of 450/500/600mm diameter Inspection Chambers.
- Lightweight - no lifting equipment required.
- Fast, easy installation - no wet trades.
- Shafts can be easily cut to required depth on site.

See the range


tick Resilience: Ability to tolerate all necessary maintenance activity.
tick Post connections: Easily installed, leak tight.
tick Over 25 years of use: A system that is tried and tested.
tick Fully tested: Meets requirements of BS EN 13476-3 and WIS 4-35-01.

tick Fewer joints: With closer tolerances to reduce leakages and blockages.
tick Health & Safety: Safe site and trench handling.
tick Socketed fittings with no pipe chamfering: Quick and easy to install.

tick Flexibility: To tolerate ground movement more readily without failure.
tick Unique joint design: No ring displacement, secure joints every time.
tick Smooth bore: For improved hydraulic performance.
tick Ribbed profile: Enhanced axial and radial strength.



Pipe - Kitemarked to BS EN 13476-3.
Pipe - Water Industry Specification WIS 4-35-01.
Fittings - Covered by British Board of Agrément Certificates.
Chambers - To either BS EN 13598 Parts 1 or 2.

Industry acceptance

Ofwat Design & Construction Guidance
Sewers for Adoption: 6th, 6A and 7th Edition, under its generic name of:
Thermoplastic Structured Wall Sewer Pipe.


Osma UltraRib - Product and Installation Manual


Osma UltraRib Product Selector


Osma UltraRib Product Selector


UltraRib Site Consultation

Request for a consultant to contact you

*Free site pack given only after a consultation

We will keep your data safe and give you full transparency and control as stated in our privacy policy. You can update your preferences or unsubscribe from our communications at anytime.