Just had a dual flush toilet fitted all works OK.
BUT, there is a loud clonk noise as the valve shuts off at the end of the
short flush. After the long flush there is hardly any noise.
My sister has a similar toilet but there is no clonking noise at the end of
the flush, is this a fault ?, is there any way to stop the noise?
Does anyone know of a site that explains how these dual flush systerns
work?? Ant info appreciated.