"Nigel Molesworth" wrote in message
news
On Wed, 24 Aug 2005 17:01:06 +0100, Sue Beans wrote:

I've tried unscrewing the screw to open up the ring

When it runs out of thread, it won't loosen anymore. If you really
need to split the ring open, pull it apart by hand.

As others have said, this isn't something that should be on the inlet,
unless the installer had made a bodge of course.

--
Nigel M

I recall that when I bought a sink u-bend with a washing machine waste
spigot there was no hole in the spigot. It needed the have the end cut off
to allow it to work - in other words it didn't have an opening otherwise
emptying the sink without the washer attached would have caused a flood
under the sink. See example:
http://tinyurl.com/bjhk7