"Rob Morley" wrote in message
t...
In article , "mackem"
says...

Overfill it! and see what happens.

I haven't installed the new stuff yet as I was hoping to determine if I
had
the correct parts first.

Do you need to install it? I'd just fit the syphon to the cistern and
fill it with a bucket or hose.

Tried it and it and the overflow does work by draining into the bowl !!
Don't know how it works as externally it looks identical to the old syphon
that needed a separate overflow.
Thanks for the contributions.