Plastics piping systems for water supply - Unplasticized poly(vinyl chloride) (PVC-U) - Part 4: Valves and ancillary equipment; German version EN 1452-4:1999— 18 стр.
Plastics piping systems for water supply - Unplasticized poly(vinyl chloride) (PVC-U) - Part 5: Fitness for purpose of the system; German version EN 1452-5:1999— 12 стр.