This standard applies to pipes and fittings of longitudinally welded stainless steel pipes with spigot and socket for waste water systems. It specifies dimensions and tolerances for pipes, fittings and pipe connectors and establishes a system of designations for the different pipe and fitting types that conform to the stated requirements. This European Standard is only valid in connection with EN 1124-1. It does not apply to the marking of products. EN 1124-1/A1 applies to the marking.