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Thread: Trap 2-fer

  1. #1
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    Default Trap 2-fer

    Found a 2-fer today. Two P traps sharing a single vent under the kitchen sink AND an S trap in the master bath.

    I guess you could call it a 3-fer since the dishwasher did not have a high loop before it emptied into the garbage disposal using the shared vent between the 2 P traps.

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  2. #2
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    Default Re: Trap 2-fer

    I do not see a problem having two traps.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  3. #3
    James Duffin's Avatar
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    Default Re: Trap 2-fer

    The trap in the third picture in the bath looks okay too. They used a P trap and PVC 90^. How else could it be done?


  4. #4

    Default Re: Trap 2-fer

    With an aav so that it's vented.

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  5. #5
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    Default Re: Trap 2-fer

    Good point....


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    Default Re: Trap 2-fer

    Quote Originally Posted by Rick Cantrell View Post
    I do not see a problem having two traps.
    The traps share a single vent. One could siphon the other dry.

    "The Code is not a peak to reach but a foundation to build from."

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    Default Re: Trap 2-fer

    Quote Originally Posted by Rick Cantrell View Post
    I do not see a problem having two traps.
    There are two trap arms shown, one from the vent out to the right and one from the vent out to the left, that is allowed.

    Quote Originally Posted by James Duffin View Post
    The trap in the third picture in the bath looks okay too. They used a P trap and PVC 90^. How else could it be done?
    Quote Originally Posted by John Goad View Post
    With an aav so that it's vented.
    The third photo is an 'S' trap and is not allowed, the easy correction is an AAV as John said (and James added as a "Good Point").

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  8. #8
    mike huntzinger's Avatar
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    Default Re: Trap 2-fer

    Disposal should have a air-gap device or high loop


  9. #9
    Mitchell Chiger's Avatar
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    Question Re: Trap 2-fer

    Quote Originally Posted by John Goad View Post
    With an aav so that it's vented.
    Newbie question: What's an AAV? Thanks. Enjoy reading the forum.


  10. #10
    Paul Johnston's Avatar
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    Default Re: Trap 2-fer

    Quote Originally Posted by Mitchell Chiger View Post
    Newbie question: What's an AAV? Thanks. Enjoy reading the forum.
    Air Admittance Valve.


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    Default Re: Trap 2-fer

    Quote Originally Posted by Jerry Peck View Post
    ...The third photo is an 'S' trap and is not allowed, the easy correction is an AAV ....
    If an AAV is allowed. They're not in Philadelphia.

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  12. #12
    James Duffin's Avatar
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    Default Re: Trap 2-fer

    In the third picture I was thinking the vent was not visible...like it was vented like an island sink would be.


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    Default Re: Trap 2-fer

    In the third picture I was thinking the vent was not visible...like it was vented like an island sink would be."

    An island sink, like this one, should have a loop vent, however, in most areas an AAV is allowed.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

  14. #14
    James Duffin's Avatar
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    Default Re: Trap 2-fer

    I have seen wet venting allowed on island sinks but if the pipe is not sized properly it can siphon the trap.


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    Default Re: Trap 2-fer

    Quote Originally Posted by Rick Cantrell View Post
    In the third picture I was thinking the vent was not visible...like it was vented like an island sink would be."

    An island sink, like this one, should have a loop vent, however, in most areas an AAV is allowed.
    Not an island sink. Master bath sink as stated in original post. Located on second story with direct access to roof with no obstructions to prevent installation of a vent to the exterior. Master bath was an 2004 bump out addition to a 1971 split level.

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  16. #16
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    Default Re: Trap 2-fer

    Maybe I was not very clear in my wording.
    I should have said:
    An island sink, as well as this one, should have a loop vent,...

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

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    Default Re: Trap 2-fer

    Quote Originally Posted by James Duffin View Post
    In the third picture I was thinking the vent was not visible...like it was vented like an island sink would be.
    Nope, that is a plain old (or new) 'S' trap.

    Quote Originally Posted by Rick Cantrell View Post
    I should have said:
    An island sink, as well as this one, should have a loop vent,...
    An island sink COULD have an AAV (where AAVs are allowed, which is most, but not all, places).

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  18. #18
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    Default Re: Trap 2-fer

    Have it fixed by someone who not only understands drainage, but also venting.

    Ya just gotta wonder sometimes.

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  19. #19
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    Default Re: Trap 2-fer

    100 yr old house coverted into apartment building. "Plumber" used the same technique in all 4 kitchens.

    Two bowl kitchen sink. Individual traps on each bowl T'ed into a single pipe that goes down and and out but no vent. Do these become doubled S traps?

    Since the two traps share a pipe before they exit and there is no visible vent, then this is not a valid configuration?

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  20. #20
    Mitchell Chiger's Avatar
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    Default Re: Trap 2-fer

    Quote Originally Posted by Paul Johnston View Post
    Air Admittance Valve.
    Thanks, Paul.


  21. #21
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    Default Re: Trap 2-fer

    Bruce
    Pics 1,2,&3, are S Traps. Pic 4, I cannot tell, it looks like ot goes into the wall, so it could be vented.

    ' correct a wise man and you gain a friend... correct a fool and he'll bloody your nose'.

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