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Discuss Incoming mains black plastic pipe to 15mm copper in the Fittings & Pipes area at UKPlumbersForums.co.uk.

  1. Jon

    Jon New Member

    Hi.

    Have a mid 1980’s house with the mains water coming in from underground via a black plastic pipe, of which the external diameter is 27mm. There does not appear to be any markings on it, but maybe some faint green.
    This goes into a 15mm copper pipe via a stop tap with compression connections. There is a slight leak and due to a new room layout I need to take apart and reconnect the black plastic pipe straight to 15mm copper pipe without the need for the tap.

    Is there a straight connector out there for connecting this 27mm black plastic pipe straight to 15mm copper pipe please?

    Thanks, Jon

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  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Imperial polly best get a transition fitting to copper

    Plasson/ philmac etc
     
    • Like Like x 2
    • Agree Agree x 2
  3. scott_d

    scott_d Plumber GSR Top Contributor!!

    Philmac utc
     
    • Like Like x 1
    • Agree Agree x 1
  4. Jon

    Jon New Member

    Thank you, will look into philmac. Is this polly stuff brittle? Should I be being very careful with it? and how’s best to cut the end off for the best joint?
     
  5. scott_d

    scott_d Plumber GSR Top Contributor!!

    Shouldn't be brittle but be gentle with it anyway
    Don't forget an insert
     
    • Like Like x 1
  6. Jon

    Jon New Member

    Thanks. Forgive my ignorance but what insert?
     
  7. DGT plumbing

    DGT plumbing New Member

    An "insert" goes inside the black pipe to strengthen the side wall to prevent it being crushed or collapsing if stretched.
     
    • Like Like x 1
  8. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    You don't need an insert with black poly
     
    • Like Like x 2
    • Agree Agree x 1
  9. Jon

    Jon New Member

    Ah yes I’m with you now! I guess until I take it apart I won’t know the diameter of the insert required? Although 22mm is most likely do you think?
     
  10. DGT plumbing

    DGT plumbing New Member

    Yeah ShaunCorbs is correct you don't need an insert.
     
    • Like Like x 1
  11. Jon

    Jon New Member

    Looking at Philmac now, but sooooo many fitting types I can’t work it out. The poly pipe is 27mm external diameter onto a 15mm copper pipe. Any idea which connector??
     
  12. DGT plumbing

    DGT plumbing New Member

    Maybe this one, code 1143
    Products | Philmac

    What I generally do is cut a bit of the pipe off and take it with me to the wholesalers.
     
    • Like Like x 1
  13. scott_d

    scott_d Plumber GSR Top Contributor!!

    15-21 x 21-27
    copper x plastic
     
    • Like Like x 1
  14. Jon

    Jon New Member

    Thank you all, great advice and just what I needed. What tool is best to use to cut the plastic pipe to make a good end to connect?
     
    • Like Like x 1
  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Plastic pipe cutters

    TBH hacksaw will work needs to be filed afterwards and debured
     
    • Like Like x 1
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