On 26/04/2019 07:37, Brian Gaff wrote:

My guess is that these devices are pretty crude, Anything that is supposed
to work as a tap on a working main without it being cut runs the risk of
jamming debris in the pipe and all sorts of other nasties in my view.

Although you cannot see it Brian, there is a Youtube video of one being
dismantled. When fitting the valve the pipe is fully cut and the debris
compressed as a slug in the recess in the back of the fitting.

https://www.youtube.com/watch?v=H9JSbIPLffM
the dismantling is after the pressure testing bit.

That is assuming that the valves have been installed correctly in the
first place and the cutter was fully wound in.

If the handle on the valve is working and can be turned than I doubt
that the debris slug could fully block the pipe and water would still
flow, maybe at a reduced rate.

One has to wonder if the fill valve to the toilet is actually the
problem and its that that is not opening to allow the toilet to fill?





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