DIN EN 13598-2-2016 无压力地下排水和排污用塑料管道系统.非增塑聚氯乙烯(PVC-U)、聚丙烯(PP)和聚乙烯(PE).第2部分:检修孔和检查室用规范
Plastics piping systems for non-pressure underground drainage and sewerage - Unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) - Part 2: Specifications for manholes and inspection chambers; German version EN 13598-2:2016