DS EN 1401-1:2009 Plastics Piping Systems For Non-Pressure Underground Drainage And Sewerage - Unplasticized Poly(Vinyl Chloride) (Pvc-U) - Part 1: Specifications For Pipes, Fittings And The System Defines the requirements for solid wall pipes, fittings and the system of unplasticized poly(vinyl chloride) (PVC U) piping systems in the field of non-pressure underground drainage and sewerage: a) o