In an earlier contribution to this discussion,
mackem wrote:

I have a 15mm pipe supplying my upstairs mains water for the bathroom
and loft storage tank.
Downstairs there is a stop cock in this pipe and ideally I would like
to have a drain valve immediately above the stop cock to allow me to
drain all the cold water pipework upstairs.
Would appreciate any advice on parts I could use for this.
Tia

You could replace the stopcock with one which incorporates a drain point -
or you could simply insert a 15mm tee into the pipe immediately above the
stopcock, and fit a drain point into the branch. Take you pick between
solder, compression or push-fit fittings - you can get the appropriate bits
for any of these types.

This will enable the *pipes* to be drained but not, of course, the cold
storage tank.

While you're at it, you might consider fitting a full-flow quarter-turn
valve innediately above the stopcock and below the drain point. When you
want to turn the water off, use this quarter turn valve rather than the
stopcock - it's much easier and quicker.
--
Cheers,
Set Square
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