A Single Detector Check Valve backflow prevention device can be used in Victoria to provide low hazard protection for building fire water services, it incorporated a backflow protected metered bypass to detect leaks and illegal unmetered water use at low flow rates. Low flow rates will occur at any time other than when testing, flushing or using a fire hydrant. Single Detector Check valves are containment devices and require annual testing and certification to satisfy the requirements of the local water authority.

Why bother with regulations?

I saw this the other night in a public facility. Why do we bother with rules and regulations when ‘experts’ undertake work that does not comply, but still works, solves a problem, gets by, is cheaper. Only those who have been trained correctly as plumbers would have any idea, nobody else would notice or care.