Kitchen sink P trap leaks

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Tlhfirelion, Aug 15, 2020.

  1. Tlhfirelion

    Tlhfirelion Member

    Joined:
    Feb 2, 2013
    Location:
    Missouri
    Hello. New kitchen sink install. I used an older P trap I had laying around and it leaked at the same spot. I figured it was just old so I bought a new one. It’s leaking at the same spot.
    (See pic where the level is pointing too)

    I figured it was loose so I hand tightened it as hard as I could. That helped. Well, came back to check it 10 minutes later and the floor is wet again. So, like any good DIY’er, I grabbed my trusty old pliers and put the gear of God Into it. That helped more. Come back 10 minutes later and it’s still leaking. If I crank on it anymore I’m sure it’ll break and I knew before hand that wasn’t the answer.

    I am gonna assume that the issue is not the 2 P trap’s but something I am doing incorrectly that is causing this issue. Any direction or advice?

    Thank you in advance for your assistance.
     

    Attached Files:

  2. Terry

    Terry Administrator Staff Member

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    Occupation:
    Plumber
    Location:
    Bothell, Washington
    Looks like an S trap there. Normally I would expect to see an AAV for venting there.
    No hose clamp on the dishwasher hose. Surprised that isn't leaking.
     
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  4. Tlhfirelion

    Tlhfirelion Member

    Joined:
    Feb 2, 2013
    Location:
    Missouri

    I’ve not put the hose clamp on yet, still trying to get this leak fixed but that will be done.
    What do you mean AAV?
    Thank you for the reply.
     
  5. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    An Auto Air Vent breaks the siphon so that the p-trap doesn't siphon itself empty and lose the water seal that prevents sewer gas into the home.

    Here is one below for a bathroom sink.

    [​IMG]

    Normally the drain for the kitchen sink would be coming from the wall with the venting going through the roof.

    [​IMG]

    Here is a kitchen sink using an AAV on the drain from the wall, used if they didn't have the vent in the wall going up. Normally I see this on an Island where you don't have a wall to go up in.

    [​IMG]
     
  6. Tlhfirelion

    Tlhfirelion Member

    Joined:
    Feb 2, 2013
    Location:
    Missouri

    Thanks for the detailed reply. My kitchen sink does have a vent thru the roof, it’s tied into the laundry room vent which you can’t obviously see in my pic. Do I still need the air vent under the sink as well? How can I best address the leaking issue I am having? Thank you.
     
  7. Sylvan

    Sylvan Still learning

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    plumbing - fire suppression - boiler inspector
    Location:
    New York
    If your tied into a real vent then you do not need to use a cheater vent
     
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  8. gagecalman

    gagecalman Member

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    Nov 25, 2016
    Location:
    Baltimore, MD
    Can you post a picture from a different angle with the level removed? Can't see how that's connected.
     
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  9. Jeff H Young

    Jeff H Young In the Trades

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    poor workmanship. no vent I think you should adress the vent issue
     
  10. Tlhfirelion

    Tlhfirelion Member

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    Location:
    Missouri
    E19AF6FF-5206-4F92-8140-3C477FF8832E.jpeg 8BFD6DFD-B8FE-4F46-98A2-BC118993B575.jpeg
     
  11. Tlhfirelion

    Tlhfirelion Member

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    Location:
    Missouri
    the issue is that this connection keeps leaking, thank you for your reply. . 9C55F85B-7E2C-4030-AABB-9C662580FCAA.jpeg
     
    Last edited: Aug 17, 2020
  12. dj2

    dj2 In the Trades

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    Location:
    California
    There's a chance you misthreaded the nut in your circle. It's easy to do when you are working up from down under...
    Take the nut off, check the thread on the elbow. Wrap some white tape on the thread - it something that doesn't have to be done normally - and see if it helps.
    Are you right handed? If yes, do it with your right hand. Then tighten with a plumbers or adjustable wrench (not your pliers) while holding the elbow with your other hand firmly.
     
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  13. gagecalman

    gagecalman Member

    Joined:
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    Location:
    Baltimore, MD
    You definitely have a S-trap and it should be addressed. Take a look at post #4.
     
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  14. Tlhfirelion

    Tlhfirelion Member

    Joined:
    Feb 2, 2013
    Location:
    Missouri
    I started over and followed your directions exactly and it appears to have fixed the leak. I ran water for 10 Minutes and saw no more leaks.

    thank you, sir, for your help and solution!
     
  15. Tlhfirelion

    Tlhfirelion Member

    Joined:
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    Location:
    Missouri
    I am a bit confused over something. What is the drawback to an S trap vs P? I may have misunderstood but I read that if I am vented thru the roof, I don’t need to add the AVV or change my set up. Thank you for your assistance.
     
  16. gagecalman

    gagecalman Member

    Joined:
    Nov 25, 2016
    Location:
    Baltimore, MD
    S-traps can suck the water out of the trap as the water flows down the drain.
    The trap arm should not go down until it is vented.
    If there is a roof vent it does nothing for the kitchen drain.
     
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  17. Jeff H Young

    Jeff H Young In the Trades

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    Location:
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    The issue is that the vent thru roof dosent accomplish its purpose in an s trap situation.
     
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  18. Tlhfirelion

    Tlhfirelion Member

    Joined:
    Feb 2, 2013
    Location:
    Missouri
    Ahh, ok. Now I get it. So I guess I get to remove what’s there and redo it?
     
  19. Reach4

    Reach4 Well-Known Member

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    IL
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