"Murmansk" wrote in message
...
I've been asked to sort out a toilet cistern that keeps on filling and so
overflowing.

Photo of offending item he

https://www.dropbox.com/s/vtfogxvkne...29.04.jpg?dl=0

Is it just a case of removing the circular blue bit and replacing a washer
or diaphragm or something inside there?

Thanks


I would just replace the whole thing ......