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Discuss Drain off cock washer in the Fittings & Pipes area at UKPlumbersForums.co.uk.

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  1. Plumb37

    Plumb37 New Member

    Hi,

    Has anyone seen a drain off washer like this?
    94E40418-2188-4489-9C3B-B8EAF85FC44C.jpeg
    Which has come out of this drain off cock:

    BBD07D85-9B6F-4C59-8285-886D714C9F3B.jpeg

    I’ve changed it for a normal flat washer but the valves still leaking slightly.

    Any help or advice would be much appreciated.

    Thanks
     
  2. townfanjon

    townfanjon Trusted Plumber GSR Top Contributor!!

    It looks like the right washer , its just been overtightened .
    Where did you buy the replacement washer ?
     
  3. Plumb37

    Plumb37 New Member

    Thank you for your reply. I believe it was a doc washer pack of 10 type A & B flat washers from city plumbing or Travis Perkins.
     
  4. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Sure it should be an MT washer you want to use mate.
     
  5. snowhead

    snowhead Well-Known Member

    You need to clean the valve face where the washer seals against.
    If the previous one has been leaking for a while the seat may be badly pitted and the only option then would be to replace the complete D.o.c.
     
    • Agree Agree x 2
  6. Ric2013

    Ric2013 Plumber Top Contributor!!

    Not sure what you mean... can you re-phrase?
     
  7. Harvest Fields

    Harvest Fields Trusted Plumber GSR Top Contributor!!

    Not really. Parts centre where I am call the washers that go inside drain offs MT washers
     
    • Like Like x 1
  8. Jim Goodenough

    Jim Goodenough Plumber

    MT = empty e.g. empty the pipework or 'MT' (drain-off/down)
     
  9. Plumb37

    Plumb37 New Member

    Thanks for all the advise. It’s sorted now.

    I still can’t work out what the washer is in my original post, it’s a cross between a dome and a flat washer. I’ve never seen one before.
     
    • Like Like x 1
  10. Ric2013

    Ric2013 Plumber Top Contributor!!

    I suspected you meant MT= empty=draw-off cock washer, but I wondered if you meant, are you sure you want to use a DOC washer mate? Or if MT meant something else. But fine, I get what you meant now, thank you.
     
    • Friendly Friendly x 1
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