In an earlier contribution to this discussion,
Frank Stacey wrote:

For various reasons I find that a plumbing job on which I have
embarked involves using plastic (HEP) pipe for various awkward runs
with copper at either end. Am I right to assume this can be done
without restriction?

In some places I am using straight metal compression couplers between
copper and plastic with an insert in the plastic pipe. In other
places I have plastic elbows with plastic on one branch and copper or
chrome plated copper on the other. Are there any gotchas I should
know about?

Excuse the paranoia, but once completed most of this stuff is going
to be under the floor of a small bathroom and very inaccessible. I
dread having to rip out my carefully installed fittings as water
seeps through the ceiling below!!

Frank [the tentative plumber]

That'll work fine. Just make sure that all pipes - whether copper or plastic
are pushed home fully into the fittings. (make a mark on the pipe with a
felt-tip pen the right distance from the end, and make sure that this is
only just visible).

My only reservation would be chrome plated pipe - having never used any! It
may be ok, but I would be slightly worried in case the chrome is too hard
for the star-lock washers to dig into and grip properly. I would be tempted
to use compression joints here.
--
Cheers,
Set Square
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