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Best of Both Worlds

Hepworth Clay and
Wavin Osma Ultrarib

The only company able to meet all your
adoptable sewer needs

Wavin is the only supplier to provide the best of both worlds in adoptable sewer pipe systems. Clay or plastic. Hepworth or UltraRib. Choose Wavin and guarantee a project proven solution, manufactured in the UK. 

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Fired to Perfection

Hepworth Clay is the sustainable ‘fit and forget’ drainage solution suitable for all ground conditions.

Learn more about ClayLearn more about Clay

There's strength in every rib

OSMA UltraRib is the UK’s only solid wall, ribbed, plastic pipe system.

Learn more about UltraRibLearn more about UltraRib

To find out more about our UltraRib and Hepworth Clay solutions and which would be the best fit for your needs, please request a consultation below. 

Approvals and accreditations

Wavin Osma UltraRib


  • 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.

Quality assured

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


Hepworth Clay

Hepworth SuperSleve products are kitemarked to BS EN 295-1, have a CE mark and Declaration of Performance (DoP), and are manufactured under a quality system approved to BS EN ISO 9001.

Hepworth Clay

Clay drainage’s resistance to high water pressure jetting means more blockages will be cleared first time with reduced risk. SuperSleve pipe has a Lifetime Jetting Guarantee* 7500 psi at a flow rate not exceeding 20 gals/min held static for 5 minutes, providing a 50% higher operating pressure than the WRc requirement for clay pipes.