On Thu, 15 Jul 2010 01:27:46 -0700 (PDT), Matty F
wrote:

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.

Doesn't the disk have a small hole in it to equalise pressure? That's
what I've read on one of the suppliers' sites.

MM