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Quick bathroom sink question for the plumbing experts out there

  • 09-02-2018 9:10am
    #1
    NIMAN
    Registered Users, Registered Users 2 Posts: 34,696 ✭✭✭✭


    The bathroom sink in my ensuite stopping draining out of the blue.

    Obviously 1st port of call was to try throwing some drain unblocker down it. This had no effect.

    Did a bit of poking with pieces of wire next, again that didn't have any effect.

    It is a sink with a pedestal cemented in place with tile grout, so it was awkward to access the pipes behind, but I ended up with the help of a mirror getting a look.

    I twisted a screw cap and heard some air escaping, and the water started to flow. I'm guessing I had some kind of airlock?

    Anyway, this cap was at the top of a bend in the pipe, I assume it is some sort of vent? When I took it off, it appeared to have a diaphragm. I have it back on now and not fully tightened and all appears ok, when I tighten it fully the water stops flowing.

    If this is correct, why did the water suddenly stop flowing when no-one was at the pipes?


Comments

  • #2
    my3cents
    Closed Accounts Posts: 9,764 ✭✭✭my3cents


    Any chance the trap was like this? Used afaik when say a toilet or bath when emptied creates a vacuum in the outlet pipes that pulls the water out of the trap?

    If there is another trap in the system further along the pipes from the basin then its possible that the back pressure it causes would stop a normal trap from emptying.

    Just thinking this through until a real plumber explains it.


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