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Plastics piping systems for hot and cold water installations. Polyethylene of raised temperature resistance (PE-RT) - Guidance for the assessment of conformity Ingestion-build-132972 With coarse thread M5 ≤What is this standard about? This document gives requirements and guidance for the assessment of conformity of materials, products, and assemblies in accordance with the applicable part(s) of ISO 22391 intended to be included in the manufacturers quality plan as part of the quality management system and for the establishment of certification procedures. In conjunction with the other parts of ISO 22391 (see Foreword), this document is applicable to