Joining multicoat pipes to pex query

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Daniel OReilly

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Nov 8, 2021
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Hi first post here, hopefully the last!

I'm extending my water down into my cellar and need to Tee-off from my existing system. In the picture, you can just about see: the darkest blue pex-type plastic pipe sleeve is where the water enters the house.

My query: I'm going to use a compression fitting T-joint (non crimp) the type that that screws down onto a copper olive, to join into this mains pipe, retaining the same size fitting (20cm outside diameter.) When I use this compression fitting on this existing pipe, must I use plastic inserts in the pipe to stop then collapsing under the compression? From what I understand, multilayer pipes don't need an insert, but here in joining into plastic I probably do. Ideas please! 👍IMG_20211103_093419.jpg
 
inserts for sure, broadly speaking.
We do not have anything like what your photo illustrates approved for use here in the US, but I have worked on a friends house in Bali and know that there are a crazy lot of variety out there for joining.
 
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