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This document outlines the major updates in the 2025 editions of AS/NZS 3500.1 and AS/NZS 3500.4, highlighting crucial changes to plumbing regulations for water and heated water services. Key amendments include new classification, temperature, and accessibility rules for flexible hose assemblies, mandatory isolating valves, reclassified backflow prevention devices, and updated pipe sizing limits.
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Version history
Category
Guide
Version
1.0
Published
25 November 2025
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