Plumbing new 1 and a half basin kitchen sink - external waste outlet too low

Discussion in 'Plumbers' Talk' started by Rory Fraser, May 17, 2022.

  1. Rory Fraser

    Rory Fraser New Member

    Hi all,

    first post on the forum, I’m hoping it’s in the right place for plumbing queries!

    I’ve recently got a new sink and have attempted to plumb the trap for a one and a half bowl.

    everything seems to of gone ok so far, apart from the trap is coming in lower than the external waste outlet. The external waste outlet is about level with the sink waste.

    This might be a really stupid question but are there any parts I can fit onto the trap to take it up to the external waste pipe?

    please see the photos, I still need to cut the pipe going left to right so the trap ends up in the same plane as the the external waste pipe. Also please ignore the nackered copper pipe this is in the process of being changed as well!

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  2. Tilt

    Tilt Screwfix Select

    Really need to drill a new hole and fit a new waste pipe outlet.

    There are hundreds of plumbing parts available so you could possibly mash it together but it certainly wouldn't work very well.
    dcox likes this.
  3. Hausfix

    Hausfix Well-Known Member

    It’s difficult to tell from your photo, but if that grey outlet pipe is being fed through the back panel of your cabinet, there is a possibility that it drops down in the void behind the cabinet and flows out to the drain at a lower level. If you are 100% certain it passes straight through the exterior wall at that level, then drilling a new hole much lower is the only option really, but if it doesn’t, cut away some of the back panel below the grey pipe and see if you can cut it and add a new elbow lower down.
    Cliff Rees likes this.
  4. FlyByNight

    FlyByNight Screwfix Select

    Have a good look at teh LIRA range of high quality wastes. They are very adjustable and in many different variants for 1, 1.5, 2, 3 bowl, with/without washing machine or dishwasher connections &c.
    jimbobby likes this.
  5. jimbobby

    jimbobby Active Member

    Eve with that Lira range It looks like it will not solve the problem.
    Maybe a bit more investigation into the grey pipe run ?
  6. FlyByNight

    FlyByNight Screwfix Select

  7. Hans_25

    Hans_25 Screwfix Select

  8. Rory Fraser

    Rory Fraser New Member

    Hi All, thank you for the replies so far.

    Bit of an update:

    So this is the initial product i bought:

    It's strange though as i'm have trouble connection 40mm fittings to it. I've attached a video with a 40mm coupler for an example, you can see it's just slipping off.

    @Hans_25 I bought a 40mm flexcon40 as you've linked and had trouble fitting that due to the pipe being too small for the the the threaded nut haha

    I think what i need to to is a combination of this part to fit to my trap:

    I can then screw one end of the 40mm flexcon pipe into that.

    Then i was going to replace the existing elbow compression fitting going onto the external waste pipe with just a standard one, as the fitting that came in the sink kit set has one size thread end that matches a standard 40mm coupler size but the other end that is connecting to the trap is threaded so i'd have to cut it off but then have the same problem of the pipe being to slim.

    If i replace with a elbow like this i should just be able to screw the other end of the flexcon pipe on?

    or could i use the existing fixing with one of the T fixings like this?

    Sorry for the long winded post. I know this isn't the best solution but i just don't have the cash to drill a hole out through the wall at the moment and get someone to fit it. I'm just looking for a temporary 8 weekish solution.

    I've attached some more photos/video for info. Due to the size i've had to host on imgur.

    Any more replies would be really appreciated.
  9. FlyByNight

    FlyByNight Screwfix Select

    When I follow your link I get:

    Sign in[​IMG]
    This post may contain erotic or adult imagery.

    By continuing, you acknowledge that you are 18+ years of age.
  10. Rory Fraser

    Rory Fraser New Member

    I think that's just a general warning....I get that when i copy the link in my browser as well. If you click continue it will take you to my images
  11. Rory Fraser

    Rory Fraser New Member

    Sorry for the double post, looking at parts i think it would be a combination of the T parts then a flexcon pipe. I'm not sure if it would be best to just have a threaded flexi pipe at one end with a push fit/solvent connection at the other, looking at the technical drawings on mcalpine it says the threaded ends on the flexcon 4 are 1 3/4 inch but all of the threaded parts it can connect to that i can find are only 1 1/2 inch.

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