What "man jobs" have you done today?

Chaps,

Can I put plastic pipe into a metal compression fitting?

Yes but use a pipe insert, make sure you're extra careful to make the cut on the pipe straight so the insert sits flush properly :)

I was told once that copper olives are preferred to brass ones on plastic pipe but can't remember why!
 
I wouldn't. I'd use a speedfit between copper and plastic.

But what do I know. :p

Plenty of advice seems to say it's fine.
 
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I've used metal compression fittings with plastic pipe many times, it's perfectly acceptable.

As above use an insert though.

If using Speedfit (my preferred is Hep20 as only one insert type and you need a tool to detach) then be aware that they have two different types of insert depending on application.
 
Yeah I'd normally do this too:

I wouldn't. I'd use a speedfit between copper and plastic.

But what do I know. :p

Plenty of advice seems to say it's fine.

It seems to be a go-er for the regular 15mm compression fitting but the insert doesn't go close to fitting into the Grohe fitting. Could be because it is expecting a tap connector. I think I'll get a bit of copper and do it how I normally do it. Thanks all.
 
What insert you using ? A double seal or single ?

I think the pipe is Hep2o so I used the metal inserts.
 
insert doesn't go close to fitting into the Grohe fitting. Could be because it is expecting a tap connector.
What do you mean by this? What Grohe fitting are you trying to put an insert in?

If you're talking taps then you may need a BSP / 15mm compression adapter for it to fit.
 
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What do you mean by this? What Grohe fitting are you trying to put an insert in?
The cistern connector on first glance looked like a compression fitting but I think it is a tap connector fitting (I didn't spend much brain power looking at it, I just moved onto the other job). Hep2o with a metal insert wouldn't fit inside it, which confirmed it was a tap connector fitting.

Edit: I am grabbing this:
 
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So I tried to refit the full bore compression fitting with PTFE around the olive and some boss white on the thread. This thing is either still weeping, or I am sending myself nuts over condensation. The tissue keeps getting slightly damp!
 
So I tried to refit the full bore compression fitting with PTFE around the olive and some boss white on the thread. This thing is either still weeping, or I am sending myself nuts over condensation. The tissue keeps getting slightly damp!
Should compression fittings/olives have PTFE on them?
 
You don’t use PTFE on compression fittings. Use jointing compound like LS-X
I used PTFE on the olive not the thread.

I think I might just take the compression fitting off and go straight to push fit and use the Grohe fitting to turn water on/off.

Edit: maybe I'll swap out the compression fitting for a normal bore one. Never had an issue like this in my life!
 
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