DIN EN 1401-1/A1 E:2022 非压力地下排水和排污用塑料管道系统 未增塑聚氯乙烯 (PVC-U) 第1部分：管道、配件和系统规范 草案
Draft Document - 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; German and English version EN 1401-1:2019/prA1:2022