Straight Compression Service Valve, 15mm x ½"

This has only really got to perform two functions: stop water when it's closed and not leak. It does neither of them well, you have to be very precise to get the flow turned completely off and although what looks like a fibre washer is shown in the photo it was in my case supplied with a plastic washer which is very difficult to get a good seal with. On the plus side it looks nice enough.

We bought one, it has no friction when you turn the screw to turn it off, so water came through, bought another assuming we'd been unlucky, but had the same problem, water everywhere, not happy, waste of time and money, still have to have the water off completelt in he house as we've no way of isolating the water flooring into he toilet