Protect a drinking water network against any risk of pollution due to a possible backflow of contaminated fluid. This return may be caused by a pressure drop in the network or a back pressure from a potentially non-potable water network.
To be installed at the point at which the drinking water is supplied, after the water meter, for protecting the public network in case of installations which are complex, dangerous and difficult to check: chemical products or metal treatment plants or hospitals. On a drinking water network for protecting water supply points for sanitary use: wash-basins, showers or kitchens for example.
