BS EN 1329-1:2020 pdf free.Plastics piping systems for soil and waste discharge within the building structure - - Unplasticized poly(vinyl chloride) (PVC-U) Specifications for pipes, fttings and the system. BS EN 1329-1 1 Scope This document specifies the requirements for solid wall pipes with smooth internal and external surfaces, extruded from the same formulation throughout the wall, fttings and the...