((DIN EN ISO 1452-1, DIN EN ISO 1452-2, DIN EN ISO 1452-3, DIN EN ISO 1452-5)) The standards specify the requirements and test methods for PVC-U solid-wall pipeline components, their joints and to joints with pipeline components of other plastics and other non-plastics materials intended to be used in piping systems for the conveyance of drinking water, water for general use and waste water under pressure. Part 1 contains general requirements, e.g. the terminology and requirements for materials. Part 2 and part 3 include furthermore special specifications for pipes and fittings regarding general, geometrical, mechanical and physical properties and for marking, respectively. Part 5 provides a basis for the assessment of the fitness for purpose of the system consisting of the single components pipe, fitting and joint. The International standards have been prepared by ISO/TC 138/SC 2/WG 3 "PVC piping systems for water supply" (secretariat: NEN, the Netherlands) with active German collaboration of the Joint Subcommittee NA 119-04-06-03 GUA "Kunststoffrohre in der Trinkwasserversorgung - PVC-Rohre" ("Plastic pipes in the drinking water supply - PVC pipes") of the NAW.