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I see on my bathroom (upstairs sink tap) there is a scew on the pipe below ?

is this an isolation point? also the tap won't work it simply is not coming on (cold tap). How do i fix it?
claire Taylor, June 2009
yes an isolation valve.
if its old be careful when you turn it they are prone to leak from the seal behind the screw
tap may have a faulty washer or jumper valve.

hi-spec plumbing & heating (essex), June 2009