MM wrote:
My property was built in 2004. The bathroom cistern is dribbling
slightly into the bowl. That is, you flush the bowl, then if you watch
the surface in the bowl after the water has settled you can observe a
continual slight dribble that lasts indefinitely.

The mechanism looks like the most complicated device I've ever seen!
Look he
http://www.littletyke.myzen.co.uk/cistern/index.html


Its called an 'improvement'. There was nothing wrong with the basic siphon,
so it had to be 'improved'. Next version will prolly have three relays and
a bloody warning light...

What is this contraption? Can anyone identify the make? I've had a
quick look in Focus DIY, but none of the replacements are similar.

On the round plastic body there is the wording "To Access Seal ---"
implying that the top part can be twisted and separated from the base
and a seal replaced.

Might find a makers name if you remove it.

I do have an inline shut-off in the inflow pipe, so it's easy to
isolate the cistern for repairs. To check how much water is being lost
I turned the valve off and marked the water level with a pencil line
at 13:55 this afternoon. The level is now about 2cm lower after about
one hour. That's a LOT of wastage!

Does it eventually stop?

Any suggestions for stopping the dribbling?

Not seem that particular make before, but its highly likely that its the
internal overflow operating rather than the siphon leaking.

Try adjusting the ball valve (top right of picky) so that the water level is
say 3cm lower & that should sort it. If not try 4cm.

If the seal does need replacing, the top part does indeed twist on a bayonet
type fitting. No idea where you would get a seal unless you can find a
makers name somewhere.


HTH


--
Dave - The Medway Handyman
www.medwayhandyman.co.uk