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This Technical Specification gives guidance for parties involved in the assessment of conformity of piping systems made from GRP-UP (glass-reinforced thermosetting resins based on unsaturated polyesters) intended to be used for drainage, sewerage or water supply. It contains procedures for the assessment of conformity to the requirements in the relevant system standards for materials, pipes, fittings and joints. NOTE 1 These procedures can be included in the manufacturer’s quality plan as part of his quality system, which should conform to EN ISO 9001 or other systems, as applicable. NOTE 2 This Technical Specification can be included in a quality system subject to third party certification of conformity by acertification body that is accredited to EN 45011 or EN 45012, as applicable.