Kitchen Sink Waste

Discussion in 'Plumbing and Central Heating' started by AdamM2012, 25 Jan 2020.

  1. AdamM2012

    AdamM2012

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    Hello,

    I was just wondering if someone could help me please!

    I am changing the waste underneath my kitchen sink, as I've installed a dishwasher and needed a waste that I could connect both the dishwasher and washing machine wastes to.

    I bought this:

    https://www.screwfix.com/p/floplast-dual-sink-wash-trap-white-40mm/33137

    However, after connecting it to the sink waste successfully, the end of the trap that connects to the waste pipe (the pipe leaving the kitchen) is too high up, so I can't connect it up.

    My question is, could I use something such as this to solve the problem:

    https://www.screwfix.com/p/mcalpine-flexcon6-flexible-waste-pipe-fitting-white-40-x-210mm/9808v

    Or should I be getting something else?

    Thank you!
     
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  3. CBW

    CBW

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    You shouldn't be trying to connect higher up, that's just asking for smelly trouble. Post a photo of your outlay and we can advise better
     
  4. AdamM2012

    AdamM2012

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    Thanks for the reply.

    I have uploaded some photos at https://imgur.com/a/s3XwnnZ .
     

  5. Avoid the flexible waste - it will fill with gunk from the sink waste.

    Two compression elbows and a short length of 40mm waste pipe will enable you to link the trap and the waste pipe.
    https://www.screwfix.com/p/floplast-wc11-universal-compression-waste-bend-90-40mm/35203
    https://www.screwfix.com/p/floplast-solvent-weld-waste-pipe-white-40mm-x-3m/44310

    or, and better, use solvent weld (assuming that your existing waste pipe through the wall is suitable)

    https://www.screwfix.com/p/floplast-bends-92-5-white-40mm-5-pack/92756


    Couple of observations:

    1) Your old set up didn't have a trap
    2) Your dishwasher waste pipe needs to rise up to the level of the underside of the sink before dropping into the waste connection - otherwise the waste water from your sink will flow back along the dishwasher waste and fill the d/w sump with sink water.
     
  6. terryplumb

    terryplumb

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    How much lower does trap need to be to meet the waste pipe that exits the wall ?
    You may be able to just use a trap extension.
     
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  8. dal5band

    dal5band

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    You could look for Y connector for your existing set up - i.e. Two into one either replaces the existing connector. Eg Mcalpine twin sppiggot or viking hat connector !
    Of course you must ensure both waste pipes go high before going down to the WM or DW to stop backflow or crossflow.
    Best to persist with your trap and try some sort angle bends back to back.
     
  9. Hugh Jaleak

    Hugh Jaleak

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  10. AdamM2012

    AdamM2012

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    • Like Like x 1
  11. lostinthelight

    lostinthelight

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    If it were mine I think I would have clips on on the hoses
     
  12. DIYnot Local

    DIYnot Local

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    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

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