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BS EN 14451. Devices to prevent pollution by backflow of potable water. In-line anti-vacuum valves DN 10 to DN 50 inclusive. Family D, type A|Valves, Anti-siphonage systems, Water supply and waste systems (buildings), Marking, Sanitary appliances, Durability, Potable water, Drainage, Pollution, Endurance testing, Check valves, Size, Designations, Flow control, Vacuum techniques, Leak tests, Performance testing
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