All hose union taps must be supplied via an appropriate and adequate form of backflow protection rated equal to or higher than the highest contamination risk (fluid category) downstream for the type of backflow (back pressure or back siphonage) it is likely to be exposed to.
As some backflow prevention arrangements and devices have operational limitations you should always check with the local water undertaker to make sure they are suitable for the intended application.
Where the local water undertaker requires it zone or wholesite backflow protection should be installed.
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