.....Thoughts.......

[ShaunCorbs]

But what if the WRAS-approved DCV fails to prevent backflow because it is also faulty? Perhaps we should put another anti- backflow device behind that?

Some of the valves identified were WRAS-approved, which means that others were not WRAS-approved. If we (reasonably, I think) assume that some of the floatvalves fitted had no approval at all, then they should never have been fitted without a DCV in the first place. The irony is that the same kind of installer who failed to fit the checkvalves where they were already required (with the unapproved valves), is very unlikely to fit them as a result of this edict.

But, hey, easier to write a new rule for us to have to deal with than to ask WRAS how the *#@! they approved valves that don't prevent backflow!

feed it from a tank

 

[WaterTight]

What if it's a flat?

 

[ShaunCorbs]

What if it's a flat?

roof tank