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Compression tee for imperial 15.x mm pipe

Discussion in 'Plumbing and Central Heating' started by chris1982, 17 Jun 2018.

  1. chris1982

    chris1982

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    I want to put a tee into the copper pipe that runs (from a loft tank) to my outside tap. I assumed the pipe was 15mm, but it turns out to be slightly bigger, meaning I can't get the olives from a 15mm compression tee onto the pipe!
    What to do? I couldn't find any imperial size compression tees. Do they still exist?
     
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  3. CWHEATING

    CWHEATING

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    You can’t get 15mm imperial fittings. They don’t exist and have never existed. If it’s bigger than 15mm it’s most likely 22mm which you can get imperial fittings.
     
  4. chris1982

    chris1982

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    I measured the pipe and its inner diameter is 15mm.
     
  5. CWHEATING

    CWHEATING

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    I stand by my original comment.
     
  6. CWHEATING

    CWHEATING

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    How did you cut the pipe? Did you use a hacksaw? If so you need to file the flaired edges. I can’t think of any other reasons why they don’t fit other than they are used olives and have already been tightened onto pipework before.
     
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  7. bernardgreen

    bernardgreen

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    Sound like a 5/8 inch pipe. ( 5/8 inch equivalent to 15.875 mm outside diameter )

    Edit, seems the supplier I mention does not supply 5/8 Ts
     
    Last edited: 17 Jun 2018
  8. just pumps

    just pumps

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  9. gas112

    gas112

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    Never heard of a 1/2 inch to 15mm socket then
     
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  11. CWHEATING

    CWHEATING

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    Reading your original post I was concerned with something you said. You say run from a loft tank? This could be a typo but I’m assuming you meant the pipe running to your tank which would be mains cold water and would be best to feed your outside tap. I wouldn’t recommend feeding your outside tap with tank fed water.
     
  12. picasso

    picasso

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    The pipe might have frozen in the past making it slightly too big for 15mm olives.
     
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  13. flameport

    flameport

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    Or it's 16mm copper.
     
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  14. chris1982

    chris1982

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    Thanks all. I cut with a multicutter and did do some filing but shall try some more tomorrow. The pipe did freeze last winter indeed and bursted around where I want to fit the tee. So perhaps I should cut out a large section?
     
  15. picasso

    picasso

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    yep
     
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  16. sbgasman

    sbgasman

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    +1 for gas112,it will be old half inch pipe,clean it up and take a bit of the OD off with some emery tape,you should then be able to get a 15mm on it.
     
  17. CWHEATING

    CWHEATING

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    I honestly never thought about that. Good call.
     
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