A hose union tap incorporating a verifiable double check valve either at the inlet or out outlet provides a form of backflow protection called a Type HUK1 but can only be lawfully used if installed prior to 1st July 1999.
As these taps only provide fluid category 3 back pressure and back siphonage backflow protection, they are typically found in domestic properties. As check valves used outdoors can be prone to freezing and subsequent failure, should such a tap needed to be replaced a like for like product could be used but ideally it should be changed for a standard hose union taps and the double check valve relocated inside the property and protected from freezing.
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.
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