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Discuss Help with leaky valve under sink in the Plumbing Forum area at UKPlumbersForums.co.uk.

  1. Cat123

    Cat123 New Member

    Hi there,

    The pipes beneath my kitchen sink started leaking - lots of water was streaming down. Have used colours in the pic attached:
    - The red box is where it's leaking from
    - The green box is the valve that we turned off to stop the water leaking. I think the main tap (i.e. the silver thing on top of the sink) is ok

    Does anyone know what we'd need to do to fix this?

    Thanks!

    40137765_452759935234174_7591810795437031424_n (1).jpg
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    Strange why it's only just started to leak

    Might need a pinch up with a set of spanners
     
  3. Jim Goodenough

    Jim Goodenough Plumber

    Has the pipe been knocked quite hard by anything?
     
  4. Cat123

    Cat123 New Member

    Thanks guys - will try tightening it. It hasn't been knocked but we have had guests that are quite strong armed with turning the main kitchen sink tap on and off - would that affect it? Think it might have been dripping for a while but I hadn't heard it until yesterday because it's inside the cupboard, and there is a bit of mould on the back wall...
     
  5. Jim Goodenough

    Jim Goodenough Plumber

    Do you mean it was running down the pipe? Does the water trickle out of the mixer tap and run down the spout? If yes to these, could be poor seal between tap/sink and tap needs new washer's in.

    Is the tap qtr turn (ceramic disc) or screwdown type?
     
  6. Cat123

    Cat123 New Member

    How would I be able to find this out? I will check tonight.
     
  7. Jim Goodenough

    Jim Goodenough Plumber

    Is the tap a single or twin lever type or does it have two tap heads that you can turn round 2/3 times?
     
  8. Cat123

    Cat123 New Member

    Yes two taps, and you have to turn each tap round a few times to turn on/shut off.
     
  9. Jim Goodenough

    Jim Goodenough Plumber

    OK does tap dribble/drip when turned off?
     
  10. chris watkins

    chris watkins Plumber

    Undo the silver nut above the valve & lift it clear to check that the olive is still in the correct position before tightening it any more.
    There should be approx 10mm of copper tube showing past the brass olive, if there is you could try a couple of turns of PTFE around that pipe sticking out before you push it back into the valve & tighten back up. Only wants another half a turn once it is tight.
     
  11. Cat123

    Cat123 New Member

    Might be a silly question, but how can we get the copper pipe out to wrap the olive with PTFE? It looks like the pipe is fixed to the tap at the top and another pipe network at the bottom.
     
  12. chris watkins

    chris watkins Plumber

    There should be enough spring in the pipework to pull it apart.
    Don't forget you will need another large spanner to hold against yourself as you tighten it back up.
     
  13. Cat123

    Cat123 New Member

    Ok thanks for your help, we will try and see how it goes!
     
  14. chris watkins

    chris watkins Plumber

    let us know how you get on.
    Good luck
     
  15. king of pipes

    king of pipes Trusted Plumber GSR Top Contributor!!

    You sure it's not coming from above either where the copper tails screw in to the tap body its only a o ring seal or even where the tap seals to the sink top again only a o ring and can move if treated roughly ? . Kop
     
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