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Thread: kitchen sink plumbing question

  1. #1

    Default kitchen sink plumbing question

    Hi,
    Everything is PVC. Here is the current setup. The drain pipe coming out of the wall is 2 1/2". Then a reducer coupling to a 2" pipe. Then a 2" J-bend, and finally an adapter that connects the 1 1/2" tail piece.

    I'm about to install a new double-bowl sink. I got two 1 1/2" tail pieces, a center outlet kit (1 1/2"), a p-trap kit (1 1/2").

    Because of spacing issue, I don't think I can use any part of the 2" pipe. I'll need to connect the 1 1/2" wall tube (from the p-trap kit) directly to the 2 1/2" pipe.

    Questions:
    1) is there any problem to go from 1 1/2" (p-trap kit) to 2 1/2" ??
    2) Are there slip-joint adapter out there ? will I need some kind of reducer coupling before the slip-joint ?

    3) i have a dishwasher and air trap. Is it okay to use clear vinyl tubing (5/8") between air trap and the tailpiece ? Is this material strong enough ?

    Please be specific what parts I need... I'm a newbie

    thanks !!!
    Last edited by mf915; 12-31-2006 at 06:47 PM.

  2. #2

    Default

    You can cut the 2 1/2" back to just enough to get a 2" coupler on, insert a 1 1 1/2" x 2 1/2" bushing then insert a male trap adapter into it...then the p-trap. Size it up to make sure you have the proper distance before you start cutting so you will know where to cut.

  3. #3

    Default

    Thanks Randy.

    One more question I forgot to ask

    4) because the bowl is 9" deep. I have to shorten the two tailpieces in the attempt to get the center outlet piece slightly higher than the wall pipe going into the wall. Is there any minimum requirement on a) the length of the tailpiece b) how much center outlet is above the wall pipe

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default pipe

    You are measuring the pipe incorrectly. There is NO 2 1/2" pipe. The outside of 2" pipe is 2 3/8" and for 1 1/2" pipe it is 1 7/8". Without seeing a picture of what you have and the space available we cannot tell you which fittings you need, but a good guess would be a 2 X 1 1/2" reducer and a 1 1/2" X 1 1/2" spigot slip joint adapter glued into it.

  5. #5

    Default

    hj... I was wondering about that too but assumed he knew what he had. I've just seen so many strange things (including radiator hoses for drain pipes) that I expect about anything.

  6. #6
    Moderator & Master Plumber hj's Avatar
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    Default ppipe sizes

    I have seen a lot of blueprints where the "engineer" who designed the plumbing system has 2 1/2" and 3 1/2" pipes specified.

  7. #7
    In the Trades kordts's Avatar
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    Default

    I have 2-1/2" pvc pipe and fittings in my shop.

  8. #8

    Default

    That's something you don't see much of in the real world.

  9. #9
    Plumber Cass's Avatar
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    Default

    Quote Originally Posted by kordts
    I have 2-1/2" pvc pipe and fittings in my shop.
    I'll trade you for some of my 5" PVC.

  10. #10

    Default

    not sure if I'm supposed to be snickering or just be dumbfounded.....

  11. #11
    In the Trades kordts's Avatar
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    I have got one cut piece of 5" pvc in my shop, no fittings. My shop came with a bunch of oddball stuff.

  12. #12
    DIY Senior Member Phil H2's Avatar
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    Default

    Quote Originally Posted by kordts
    I have 2-1/2" pvc pipe and fittings in my shop.
    Yeah, but are they are they DWV fittings?

  13. #13

    Default

    it is actually 2" and 1 1/2".... As a newbie, i eyeballed the OD and thought that was a 2 1/2" and 2"

    Anyway, i got the the installation completed. Here are some pics... See how much I have shortened the tailpieces and and the tee connecting the J-bend.

    Do you guys see any issue ? What would be a better approach ?
    Attached Images Attached Images   

  14. #14
    Master Plumber Dunbar Plumbing's Avatar
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    Default

    Looks fine to me with the exception of that direct connection of the dishwasher to the waste line.


    When your sink clogs and you plunge it in your first attempt to get it clear you'll wander where that wastewater goes when it drops a little. You'll be forcing it back into the dishwasher where it was never intended to be.


    Codes to prevent such a issue are strictly enforced in Kentucky, parts of Ohio now and soon it is going to spread.


    Don't know your location so I can't tell you other than it's a safety call on judgement.
    Read what the end of this sentence means.

  15. #15

    Default

    I thought having the dishwasher connecting to the 5/8" opening of the special tailpiece is the typical way.... What's the other alternative ?

    BTW, i'll be using an air trap. So the vinyl tube coming out of the tailpiece goes to the airtrap....

    Thanks

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