NF P16-326-4*NF EN 1124-4:2013 污水系统用带套管和孔座的纵向焊接不锈钢管和配件 第4部分:真空排水系统和船用排水系统用部件
Pipes and fittings of longitudinally welded stainless steel pipes with spigot and socket for waste water systems - Part 4 : components for vacuum drainage systems and for drainage systems on ships