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Backflow preventer in brass with threaded connection (ISO 228/1), type BA. It consist of two spring check valves and an intermediate pressure controlled draining chamber. Media which have passed through the valve is prevented from flowing back into the pipe system. The valve is used to reinsure the drinking water quality according to SS-EN 1717. It assures protection for water up to category 4. Approved and tested acc. to EN 12729.