15 mm plastic water pipe


Can you join plastic 15 mm pipe and copper pipe using the same brass compression fittings that you use for copper. Thank you for any help
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Dont even think about it !!!!!! NO
go to a local plumber's merchants.....................and ask for the right fitting.
Barry
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On the other hand, provided you use the correct insert for the plastic pipe (what make are you using?) then there is no problem at all. Plumbers and DIYers frequently join plastic to copper with normal brass compression joints. You will have no problem at all. I have no idea what bs is referring to.
Adam
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Jo King wrote:

Jo,
Yes, you will need a copper to plastic compression fitting which will include a metal insert for the plastic pipe to support the compression ring and stop it from collapsing the plastic.
A good plumbers merchant would be the best place to ask for this type of fitting as they will also give advice on its use if you request it.
Brian G
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The compression fitting is still the same (a bog standard compression fitting). It is the insert onto the plastic pipe that is required. All plastic pipes that I have used (speedfit, polyplumb,hep etc) will take a normal compression fitting as long as the correct insert is fitted to the plastic pipe. It is the same insert that you need to use to join plastic pipe to plastic pipe using plastic connectors.

Unless you know of a different fitting to all the ones I have seen then there is no special fitting.
Adam
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ARWadsworth wrote:

Adam,
You are partly correct in what you say, BUT if you try and fit a compression fitting to a plastic pipe *without* the copper liner, then the olive will either refuse to compress around the pipe am slip under pressure or if it does, the pipe will collapse into itself - the olive on the copper tube will need no other support and will compress as it should to form a leak-proof joint.
As a matter of interest, I have had plumbers doubting my parentage when I have had to take compression fittings to them repairing burst plastic water pipes at 2am in the morning and forgot the copper liners - store keepers weren't too happy either when I had to call 'em out again :-)
Brian G
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Adam is correct. All you need to do is use the plastic liners with the plastic pipe and a compression fitting. I have connected many pipes this way and a local central heating engineer uses nothing else and neither of us have had any problems. -- troubleinstore
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troubleinstore wrote:

troubleinstore,
That's exactly what I said - you need a liner to go into the plastic pipe to support the olive!
If you read Adams - "Unless you know of a different fitting to all the ones I have seen then there is no special fitting" - then that is only partly correct but there is an additional fitting that is needed when joining plastic to copper using a Connex or Kuterlite compression fitting (or the ilk) - a copper liner that fits into the plastic pipe.
Remember, I am replying to the OP who asked the specific question "Can you join plastic 15 mm pipe and copper pipe using the same brass compression fittings that you use for copper."
You cannot just use a plain compression fitting to join copper to plastic - the plastic will collapse under the pressure of tightening the nut to compress the olive -ergo the sleeve to prevent this - and to say YES to that question without any further explanation, leaves the OP believing that he can join copper to plastic willy-nilly without the high chance of a leak.
But you CAN use other types of push-on fittings WITHOUT the liner that will do the job, as they are designed to 'grab' the outside of the pipe without pressure rather than compress a brass olive e.g the Yorkshire Tectite System - but that was not the question!
Brian G
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Look again at both my earlier posts on this subject. Both posts say thay you should use a liner for the plastic pipe.

On a plastic pipe I believe you still need a liner to connect to the Yorkshire Tectite
You are correct in that push fit was not the question. Using a brass compression fitting was the question. That is what I answered and I also asked what type of plastic pipe the OP was using on my first post.
I do believe you refered to a "copper to plastic compression fitting which will include a metal insert for the plastic pipe to support the compression ring and stop it from collapsing the plastic" This is the special fitting I have not seen. AFAIK the compression fitting is a normal brass fitting and you use a pipe insert.
I would also look again at the OPs name. It is probably a wind up.
Adam
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ARWadsworth wrote:

All the best
Brian G
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