In article ,
John Orrett wrote:
Just in my experience those gate valves never fully close off the
supply so have lots of towels around and act quickly!

Ta :-)

Anyway, unless you know it's been done recently, draining down and adding
fresh inhibitor does two jobs for the price of one.

--
*I got a sweater for Christmas. I really wanted a screamer or a moaner*

Dave Plowman London SW
To e-mail, change noise into sound.