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DC interrupters - back flow preventer, G1/2" male x G1/2" female. A Back Flow Preventer [BFP] is used to stop syphonage/backflow into the pipework. Without this feature, there is a risk that contaminated water can flow backwards in the system, resulting in contamination of the water supply. The standard EN 1717 is describing different BFP types and fluid categories. This standard can as such be used as determination of which type of BFP is to be used. Contact the local water authority if any doubt. Serrated metal nozzle for 1/2" thread can be ordered separately as item 25390081001
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