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Check valve need with Fluidmaster Pro45B fill valve?

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Possom

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The Fluidmaster Pro45B brass shank fill valve has an anti-siphon / backflow design which prevents contamination (according to adverts).

Is this sufficient, or does a double check valve additionally have to be added to the 15mm supply pipe? Thanks.

upload_2017-8-1_0-52-34.png
 
No check valve is required when the fill valve is fitted correctly :idea: or on domestic installations.

Why would consider a check valve ?
 

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