joining new 15mm plastic to existing 15mm copper

Mike13 · 11 Apr 2024

Hi, as title, I have some existing 15mm pipe, I need to join some new 15mm plastic pipe (it was flexible so it could be routed quickly under the floor when extension was built, now needing to connect to existing pipe
The tidiest would be if I could use a 90 degree adaptor fitting, as best place to join is close to an internal corner. I want to avoid extending the plastic part as it just always looks untidy in my eyes.
What fittings would enable me to do that? I have had a look on google, but descriptions always seem to assume you know exactly what it actually does, at least to a DIY person like me.

Mike13 · 11 Apr 2024

I am now thinking the simplest for me is to connect these two together in the corner:

Hep2O Male Adaptor Brass Spigot

Push-fit Hep2O includes unique features that enable quick and easy installation with a secure fitting. It is the only push-fit plumbing system with joint recognition, secure demounting and a 50 year guarantee.The system is compatible with both plastic and copper, making it ideal for new build...

www.toolstation.com

and

Made4Trade Compression Wallplate Elbow

• The only compression fittings range manufactured in the UK• Create a mechanical heat free connection• WRAS Approved• Suitable for use on both gas and water• Suitable for Domestic and Commercial Heating and Plumbing Applications• 25 Year Warranty • Manufactured to EN1254

www.toolstation.com

some jointing compound between them, and then run the pipes along their walls, will that work?

HERTS P&D · 11 Apr 2024

Don't forget inserts on the plastic pipe:

JG Speedfit Plastic Push-Fit Equal 90° Elbow 15mm - Screwfix

Order online at Screwfix.com. Pre-packed. Push-fit. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

Andy

Mike13 · 11 Apr 2024

Ahh, ok, but on one wall I have plastic coming up to the corner, on the other wall I have copper pipes to connect to, I dont see how 15mm copper will connect to the item you show? I thought the upper item I showed would connect into the plastic pipe, but not sure what goes on the outside of it?

As I have not done any plastic pipe fitting it is all new to me, and somewhere near or preferably at the corner I have to change from one to the other.

Mike13 · 11 Apr 2024

New idea, is this correct?
one each of these three items:

Flomasta Brass Compression Adapting 90° Wall Plate Elbow 15mm x 1/2" - Screwfix

Hep2O Plastic Push-Fit Adapting Male Coupler 15mm x 1/2" - Screwfix

Order online at Screwfix.com. In4Sure joint recognition notifies when the pipe is connected. Safe for drinking water. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

with one of the inserts from this pack:

Hep2O Smartsleeve Stainless Steel Push-Fit Pipe Inserts 15mm 10 Pack - Screwfix

Order online at Screwfix.com. In4Sure joint recognition notifies when the pipe is connected. Safe for drinking water. FREE next day delivery available, free collection in 1 minute.

www.screwfix.com

This seems it will work, but before dashing out and getting stuck half way through with the water off, I think I need to ask.
The copper bit from existing to to corner I feel comfortable with, but dont want to get half way through and have to dash out for different parts.

Madrab · 11 Apr 2024

Not sure you should be doing this given the fittings you seem to think you should be using.

Any push fit fitting, like the one that @HERTS P&D linked to, will connect to the plastic pipe and to the copper pipe, they're OD's are the same. The plastic pie with a clean cut end will take an insert and then push into one end, the copper - once cleaned/deburred or pipesliced will push into the other as it is.
Ideally you will know what make the plastic pipe is and use that brand of inserts and fittings for complete compatibility (they all fit standard copper).

Mike13 · 11 Apr 2024

Ahh, ok I did not know that you could push copper into the same fitting, that makes it cheaper. Both pipes are certainly hep20. Like I say, just a DIYer, I can manage copper piping changes ok, had many years of intermittent practice, but have barely even seen any plastic piping let alone had to add any.

Madrab · 11 Apr 2024

Yes they can indeed, copper is universal so can use any of the pipe joining methods that plastic uses. Just ensure you use a pipe slice on copper so the cut end is bevelled over or deburr if cut with a hacksaw, so the sharp edges won't wreck the push fit's seal.

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joining new 15mm plastic to existing 15mm copper

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