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Sink waste outlet height issue

Discussion in 'Plumbing and Central Heating' started by RrogerD, 7 Oct 2021.

  1. RrogerD

    RrogerD

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    Fitted a new sink but with the new McAlpine Appliance trap (single appliance inlet) https://www.screwfix.com/p/mcalpine-appliance-trap-white-40mm/81714, the 40mm waste outlet sits about 20mm below the existing pipe outlet through the wall. I don't really want to be drilling another exit through the wall if I can help it.

    Does the washing machine connection have to be level with, or above the final 40mm outlet? Can it be lower? I am thinking, add a small extension to raise the 40mm outlet, but this would put it slightly above the washing machine connection point. Presumably ok as the wash machine pipe slopes upwards so shouldn't get waste water draining back into the machine and becoming stagnant.

    Could I fit a standard P trap, which appears to have the 40mm outlet at the same height as the sink base https://www.screwfix.com/p/mcalpine-tubular-p-trap-white-40mm/75915 and then use a 'self-cutting drain out kit' https://www.screwfix.com/p/washing-machine-drain-out-kit/75883 to attach to the waste on the sink side of the u bend? Again, it would be lower than the 40mm outlet. I guess that I wouldn't want to fit one on the exit side of the u bend as it would pipe up all of the smells from the drain?
     
  2. CBW

    CBW

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  4. RrogerD

    RrogerD

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  5. CBW

    CBW

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    Might be best posting a photo of setup, see if we can see any alternative?
     
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  7. RrogerD

    RrogerD

    Joined:
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    I've fitted a standard McAlpine P trap for the time being (at least we can now use the waste. I was afraid of someone pouring water down it and ending up flooding the cupboard below).
    I'm going to have to have a think about what I can use to connect the washing machine in. I suspect one of these 'self-cutting' kits mentioned above.
    I'll get a picture tomorrow when I'm back at the house.
    Thanks so far ;)
     
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