OSMA UltraRib

UltraRib offers a comprehensive range of pipes and fittings for rainwater systems in adoptable situations requiring a stiffness SN8 classification.

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System Information

Transport and drainage

UltraRib solid wall pipes have a smooth inner surface with external ribs that provide exceptional axial rigidity and enhanced radial strength whilst remaining lightweight. The pipe is complemented by a comprehensive range of fittings.


UltraRib pipe and fittings meet all relevant regulation and compliance standards. UltraRib pipes meet the requirements of BS EN 13476-3 and are Kitemarked. The fittings are covered by British Board of Agrément Certificate no 98/3472. Easily calculate the pipe deformation values of your next project with our online tool.

High Stiffness classification

UltraRib pipes have a stiffness classification of SN8 and come in standard pipe lengths. They are available in 150mm – 300mm diameters.