Shortening a plastic pipe

[basill]

The background is I put in a new basin in the ensuite over the weekend. There were no isolation valves on the pipework to make the job easier so the first thing was to put on a couple of those so the rest of the house could enjoy water whilst I worked away. The top part of the connector already had the bit of copper attached along with a compression fitting to enable the flexible hoses to connect in.

Now that I have added on the isolation valves and the new basin is much lower the plastic pipework needs to be shortened quite a bit.

As I don't have any experience of plastic pipework I don't want to start unscrewing the coupling and end up in a world of pain as I don't have any spares lying around the house for this sort of thing.

So if someone could give me a heads up on what type of connector this is and how to go about taking off a few inches off the length it would be great.

Also would I be right in thinking there are probably inserts inside the plastic pipe that I will need to remove and reuse before I start cutting through?

Thanks in advance.

 

[Charnwood]

Looks like Hep2O.

I personally would not re-use push-fit fittings using the original O ring.

 

[basill]

I didn't think it was push fit nor Hep20? Don't those normally need a small tool to get the pipes apart from the fitting? I had a play with the end which has received the copper pipe and the end cap just unscrews. There is a load of bits and bobs on the copper inside the end cap holding it in situ. Didn't want to mess around with the other end in case I end up with a bathroom full of water and no spares on hand.

 

[Burnerman]

Not all plastic fittings are demountable......if this one is, the collars will twist to undo.
There is a special cutter for slicing through plastic pipe - you can get away without it so long as you cut the end square.
Use a new insert to be safe.....there are a couple of variations (this one will have a metal insert) and the correct one will be a snug fit into the internal diameter.
Its perfectly acceptable to use a brass compression fitting onto plastic - again, use an insert and preferably a copper olive, and join on a straight run.
John

 

[compheat]

THe fitting in question is Polyplum and although you can undo the coupling the grab ring will not come off the pipe easily

www.polypipe.com/

 

[basill]

Thanks a lot for that, its a perfect match.