"Matty F" wrote in message
...
On Jul 15, 7:13 pm, NT wrote:

any plumber's merchant should have a little rubber disc for it.

Rubber disks cause water hammer. Fibre disks don'r.




Not sure you can get fibre ones for the type he illustrated with a photo. I
know you can use fibre on the old ball valves - but modern diaphragm ones
need the flexible walls of rubber. (surely)