NF P16-353-3 ; NF EN 13476-3:2025-10-08
Plastics piping systems for non-pressure underground drains and sewers - Structured-wall piping systems of unplasticized poly(vinyl chloride) (PVC-U), polypropylene (PP) and polyethylene (PE) - Part 3: specifications for pipes and fittings with smooth internal and profiled external surface and the system, Type B