Majo Plastics Twin Wall HDPE are BBA Certified.

150 mm to 600 mm Pipes and Couplers, a range of high density polyethylene (HDPE) pipes and polypropylene couplers for use as filter and carrier pipes in highway drainage for the collection and disposal of surface and sub-surface water.


  • factors relating to compliance with HAPAS requirements
  • factors relating to compliance with Regulations where applicable
  • independently verified technical specification
  • assessment criteria and technical investigations
  • design considerations
  • installation guidance
  • regular surveillance of production
  • formal three-yearly
This HAPAS Certificate Product Sheet(1) is issued by the British Board of Agrément (BBA), supported by Highways England (HE) (acting on behalf of the Overseeing Organisations of the Department for Transport; Transport Scotland; the Welsh Government and the Department for Infrastructure, Northern Ireland), the Association of Directors of Environment, Economy, Planning and Transport (ADEPT), the Local Government Technical Advisers Group and industry bodies. HAPAS Certificates are normally each subject to a review every three years.