In an earlier contribution to this discussion,
The Count wrote:

Hi
My current bathroom hot water piping enters the bathroom on a T joint,
with one pipe going right angles to the sink and the other going
straight on to the bath. I'm moving the bath towards the sink, and am
able to run the bath off the same pipe as the sink. I was just going
to cap the remaining pipe, but wondered whether this could cause
stagnant water. The nearest place to cap it with relative ease is
1.3m from the T-joint. Is it okay to cap it there, or must I cap it a
smaller distance from the T, or replace T-joint with an elbow?

By far the best thing would be to replace the tee with an elbow. Otherwise
you will have some air trapped in the dead leg which may cause water hammer.
It could be a breeding ground for bugs, too.
--
Cheers,
Set Square
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