2010DIN EN ISO 1452-4:2010 Plastics piping systems for water supply and for buried and above-ground drainage and sewerage under pressure - Unplasticized poly(vinyl chloride) (PVC-U) - Part 4: Valves (ISO 1452-4:2009); German version EN ISO 1452-4:2009
1999DIN EN 1452-4:1999 Plastics piping systems for water supply – Unplasticized poly(vinyl chloride) (PVC-U) – Part 4: Valves and ancillary equipment