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Discuss Connecting waste from two sinks and a dishwasher to wall in one piece? in the Fittings & Pipes area at

  1. danielush

    danielush New Member

    Thanks in advance for any help...

    I need to put in a waste pipe(s) as follows; two sinks next to each other with male threaded 40mm outs, one rubber waste pipe from a dishwasher. So three waste pipes. They need to connect to one waste pipe which is hidden in the wall. The waste pipe in the wall has a 50mm female weld type connector protruding to be able to connect to, and it has been placed in the wall so that the flange to connect to is too high, it is lower than the waste pipe connectors from the sinks, but only just, about 5cm, so if I connect a waste trap to the sinks the output from the waste trap is then lower than the connector of the wall waste pipe so there is always water trapped in the pipe between the trap and wall, which I don't like. I'm an amateur and all my constructions leak at some point. Does anyone know if there is a manifold or some such piece which exists will allow me to connect the three outs to the wall in as few pieces as possible, ideally one pre-fabricated piece, so that there are no joins to leak from? Doesn't need to have a trap if it can't be done without the water level dropping below the wall waste pipe opening.
  2. Chuck

    Chuck Active Member

    Is it the top, centre or bottom of the waste pipe that is 'about 5cm' lower?

    How deep are the sinks? You might be able to find shallower one(s) that will make the problem go away.

    Have you considered repositioning the waste in the wall a few inches lower?
  3. rpm

    rpm Trusted Plumber Top Contributor!!

  4. snowhead

    snowhead Well-Known Member

    Given the 2 statements above, I think you'd be better off employing a Professional.
    It'll be cheaper and quicker in the long run.
  5. danielush

    danielush New Member

    Thanks rpm, looks better than the stuff I have, I think the main problem for the leaks actually lies with using cheap material, the seals here look much more substantial than the ones I am using.
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