DS EN 13598-1:2011 Plastics Piping Systems For Non-Pressure Underground Drainage And Sewerage - Unplasticized Poly(Vinyl Chloride) (Pvc-U), Polypropylene (Pp) And Polyethylene (Pe) - Part 1: Specifications For Ancillary Fittings Including Shallow Inspection Chambers Provides the definitions and requirements for ancillary fittings of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP), and polyethylene (PE) intended to be used in non-pressure undergroun