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36mm OD pipe to 36mm OD pipe internal fitting only

Discussion in 'Plumbing and Central Heating' started by JohnQuill, 14 Jul 2021.

  1. JohnQuill

    JohnQuill

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    Hi, hoping someone can help me here. I have a 36mm OD solvent drain pipe that is cracked and has a piece missing at the concrete surface (circled in red in the attached pic).
    I don't want to have to dig out the concrete floor. I could cut the pipe about 2cm above the concrete surface. I could then get a smaller diameter pipe that I can fit inside the existing pipe to cover the crack and extend the pipe upwards? This could then be solvent welded or fixed with silicone. Does this sound like a good idea?
     

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  3. oldbutnotdead

    oldbutnotdead

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    Sounds like a massive bodge but worth a go cos it's knackered anyway. Looks as if the missing bit is on a bend, you might be better stuffing some flexible pipe down it then sealing the flex to the hole with silicon (solvent needs quite a snug fit to get a good bond, unlikely you'll achieve that).
     
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  4. lostinthelight

    lostinthelight

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    Sealing against toxic gases escaping may be more difficult
     
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  5. dilalio

    dilalio

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    Should be screed rather than concrete and easy to remove. Do it properly.
     
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  6. Madrab

    Madrab

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    Nope ... You don't get an internal coupler like you are suggesting, so anything you'd be using would be bespoke, made up and may not work properly.
     
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  7. JohnQuill

    JohnQuill

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    ok, thanks all for your advise. looks like I'll have to get the concrete/screed removed and put in a proper connection. Time to get a plumber on the case,
     
    Last edited: 15 Jul 2021
  8. dilalio

    dilalio

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    Not necessarily. Do the excavation yourself. Do it carefully and you stand less chance of further damaging "good/sound" pipe from which you can join on to.

    Don't go "chasing the ace".
     
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