In an earlier contribution to this discussion,
mackem wrote:


It's just the pipes I want to drain, so like you say I think I'll put
a T piece just above the stopcock. From looking in the Screwfix
catalogue it's not clear how I would attach a drain cock to the T
piece.
How would I do this?
Tia

It depends on which technology you choose!

Screwfix 13349 or 17843 are designed to be used with solder fittings. They
have a 15mm inlet pipe which has to be soldered into the branch of the tee.

Screwfix 65868 screws in. You would use this if you are using compression
fittings. You would need a 15mm comp x 15mm comp x 1/2" BSP female iron
tee - which has a threaded boss on the branch for the drain fitting to screw
into. [Can't see one in the Screwfix catalogue - but your local plumbers
merchant will have one.] Seal the threads with PTFE tape.

Screwfix 12232 is very similar to 13349 etc. - but seems to be the one to
use if you're going the push-fit route. It just pushes into the branch of
the tee - where it is automatically gripped by a gripper ring and sealed by
an 'O' ring.

If using either solder or push-fit - particularly solder - you'll have to
make a good job of cleaning the pipe either side of where you cut it.

--
Cheers,
Set Square
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