On Sat, 04 Jun 2011 20:21:31 +0100, wrote:

My toilet is fitted with an Opella Dual Flush Valve
snip
The toilet has stopped working - in that if I hold in the press button
it will totally empty the tank. But if I let go the tank only half
empties - ie the valve drops down before the tank is emptied.

Er, isn't that what a dual flush is supposed to do? Press and hold
for full flush (turds), press and release for short flush (****).

--
Cheers
Dave.