On Tuesday, 16 April 2019 11:24:15 UTC+1, John Rumm wrote:

IME, its a similar "feel" to compression on copper.

Thanks John, that's good to know. I suppose even though the pipe might be plastic it still has rigidity from a metal insert.

I did read somewhere that a copper olive should be used, as opposed to a harder brass one, so that should help with the feel.