A hose union tap incorporating a 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.
In premises built after 1st July 1999 if a double check valve is to be used as point of use backflow protection for a hose union tap categorised as a fluid category 3 risk, this must be installed inside the property and if required protected from freezing.
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