In an earlier contribution to this discussion,
JJJ wrote:

I've just bought a water filter cartridge unit, which comes with the
type of self-cutting connection you normally install on the copper
cold water pipe to the tap.

The water pipes here, however, are all plastic. Will this still work
or is it just designed for copper?

Thanks,

Jim

I don't think I would want to use one on plastic pipe!

Having said that, I wouldn't want to use one on copper pipe either -
preferring a proper tee connection.

But at least it should *work* without leaking on copper. I doubt whether it
would on plastic, because the pipe would distort. I suspect that the
displaced piece would spring back and block the hole, and that the whole
thing would leak.

Doubtless if anyone out there has successfully done it, they'll come back
and refute my idle speculation!
--
Cheers,
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