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All water fittings in a bathroom must be supplied via an appropriate and adequate form of backflow protection which is rated either equal to or higher than the highest downstream contamination risk (fluid category) for the type of backflow (back pressure or back siphonage) it is likely to be exposed to.
Where the local water undertaker requires additional backflow protection such as zone protection should be installed.
The level of zone backflow prevention required is a matter for the water undertaker.
Uncontrolled if downloaded. This is informative, non-statutory guidance and intended for general guidance purposes only; it is subject to change.
Compliance with this information should not be relied upon as guaranteeing no enforcement action will be taken by water undertakers. Water Regs UK accepts no liability for loss, indirect or consequential loss arising from or in connection with this guidance document.