Term Definition AS/NZS 3500.1 Australian Standard Plumbing & Drainage – Water Supply AS/NZS 2845.1 Australian Standard Water Supply – Backflow Prevention Devices – Part 1 :  Materials, Design and Performance Standards AS 2845.2 Australian Standard Water Supply – Backflow Prevention Devices – Part 2 :  Air Gaps and Break Tanks AS 2845.3 Australian Standard Water … Continue reading Backflow Plumbing Definitions