# would this be considered an S trap? **URL:** \ **Category:** Plumbing Inspections\ **Created:** [February 11, 2012, 10:04pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712 "2012-02-11T22:04:16Z")\ **Posts on this page:** 9\ **Page:** 2
**Author:** ![jmckee](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jmckee/32/211009_2.png) [@jmckee](https://forum.nachi.org/u/jmckee)\ **Post date:** [March 1, 2012, 3:11pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/21 "2012-03-01T15:11:34Z")
that should work fine Alex ---
**Author:** ![dandersen](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dandersen/32/59398_2.png) [@dandersen](https://forum.nachi.org/u/dandersen)\ **Post date:** [March 1, 2012, 3:35pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/22 "2012-03-01T15:35:41Z")
Not with out an air admittance valve before it goes into the wall. ---
**Author:** ![jmckee](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jmckee/32/211009_2.png) [@jmckee](https://forum.nachi.org/u/jmckee)\ **Post date:** [March 1, 2012, 5:29pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/23 "2012-03-01T17:29:01Z")
true if there is no vent pipe in the wall which I was assuming there was ---
**Author:** ![dandersen](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dandersen/32/59398_2.png) [@dandersen](https://forum.nachi.org/u/dandersen)\ **Post date:** [March 1, 2012, 5:43pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/24 "2012-03-01T17:43:32Z")
Even if there is a vent pipe in the wall, it is still an “S-trap”. (According to the diagram). ---
**Author:** ![Alexander\_Alvarado](https://avatars.discourse-cdn.com/v4/letter/a/7cd45c/32.png) [@Alexander\_Alvarado](https://forum.nachi.org/u/Alexander_Alvarado)\ **Post date:** [March 1, 2012, 6:00pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/25 "2012-03-01T18:00:17Z")
I did install it last night. I used a P-trap with a 7 inch trap arm which connects directly below the sink, after the arm it makes a 90 degree turn down, travels another 7-8 inches and then turns 90 degrees back into the wall. Does that make sense? I will take a picture of it and post it tonight. There is a vent pipe in the wall. I noticed they sell S-traps at the store, not sure that means it conforms to local codes or not but the trap does seem to hold water like it should. Any scenarios I could put it through to make sure it wont siphon out? ---
**Author:** ![jjonas](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jjonas/32/301755_2.png) [@jjonas](https://forum.nachi.org/u/jjonas)\ **Post date:** [March 1, 2012, 6:08pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/26 "2012-03-01T18:08:38Z")
> [@dandersen](#): > > Even if there is a vent pipe in the wall, it is still an “S-trap”. (According to the diagram). David, Are you stating that due to the trap depth being too shallow? Jeff ---
**Author:** ![jmckee](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jmckee/32/211009_2.png) [@jmckee](https://forum.nachi.org/u/jmckee)\ **Post date:** [March 1, 2012, 6:34pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/27 "2012-03-01T18:34:13Z")
I guess we’ll have to disagree on that one Partner… ---
**Author:** ![dandersen](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/dandersen/32/59398_2.png) [@dandersen](https://forum.nachi.org/u/dandersen)\ **Post date:** [March 1, 2012, 6:35pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/28 "2012-03-01T18:35:36Z")
the diagram is not really complete so what I am “implying” is that the drop after and below the trap constitutes an S-trap depending on the scale of the diagram versus its actual construction. We don’t know where the alleged vent pipe is located so this is not a discussion, just an observation that should be considered. If there was no vent (this thread is “assuming” that there is one, that is not visible) would this be an S-trap? ---
**Author:** ![jmckee](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/jmckee/32/211009_2.png) [@jmckee](https://forum.nachi.org/u/jmckee)\ **Post date:** [March 1, 2012, 6:54pm UTC](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712/29 "2012-03-01T18:54:33Z")
the original question led me to believe all was fine until a new vanity was purchased with a bottom mount drawer, which led to the necessity of raising the P trap by shortening the tail piece to the sink, You are right that without dimensions the drawing is a little vague… [Previous page](https://forum.nachi.org/t/would-this-be-considered-an-s-trap/66712.md?page=1)