thescruff wrote on Dec 31st, 2015, 11:18pm:Sorry Ray, not possible unless you have running water and even then unlikely.
What does the valve feed/turn off.
What size pipe is the cold feed.
Is the pipe hot/warm below the valve.
The valve shuts off the cold supply from the storage tank and definitely stops the noise when fully closed.
The pipe is 22mm.
It's a cold feed, so no - not warm anywhere.
I've got the storage tank supply valve set at its lowest setting which has reduced the head of water, but not by much.
Over the last couple of weeks, the noise has been triggered two or three times by my wife walking into her bathroom. No, she's slim and fit, it's not a load problem! However, it seems that some movement or flexing of the floor sets the noise off, so I'm now investigating the mounting clips, etc. The trouble is that - when the noise starts - by the time I've got beneath the floor, it's stopped again. I can't find what or where unless it's making the noise and it's almost impossible now to make it start. Bugger!
Ray