# Never seen this **URL:** \ **Category:** Plumbing Inspections\ **Created:** [April 12, 2019, 3:30am UTC](https://forum.nachi.org/t/never-seen-this/151394 "2019-04-12T03:30:15Z")\ **Posts on this page:** 16\ **Page:** 1
**Author:** ![cphipps2](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cphipps2/32/59937_2.png) [@cphipps2](https://forum.nachi.org/u/cphipps2)\ **Post date:** [April 12, 2019, 3:30am UTC](https://forum.nachi.org/t/never-seen-this/151394/1 "2019-04-12T03:30:15Z")
![DSCF0650](https://global.discourse-cdn.com/internachi/original/3X/7/d/7de607e492854c5e3d90c95a3f5e5f8e6cf19b3c.jpeg) Have not seen this plumbing setup before under kitchen sink? ---
**Author:** ![cmisner](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cmisner/32/57038_2.png) [@cmisner](https://forum.nachi.org/u/cmisner)\ **Post date:** [April 12, 2019, 3:59am UTC](https://forum.nachi.org/t/never-seen-this/151394/2 "2019-04-12T03:59:29Z")
Looks like from what I can see is that this sink probably backs up quite a bit! IDK ---
**Author:** ![cevans](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cevans/32/244194_2.png) [@cevans](https://forum.nachi.org/u/cevans)\ **Post date:** [April 12, 2019, 4:29am UTC](https://forum.nachi.org/t/never-seen-this/151394/3 "2019-04-12T04:29:11Z")
It’s in improperly executed island fixture vent. ---
**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:** [April 12, 2019, 11:47am UTC](https://forum.nachi.org/t/never-seen-this/151394/4 "2019-04-12T11:47:59Z")
![Island%20Sink%20Venting](https://global.discourse-cdn.com/internachi/original/3X/c/0/c01e02746b07e283408f210a7a2219160eb3a2e3.jpeg) It’s rare, but I do see kitchen sinks plumbed as an island when they are not islands. Most often when the kitchen is an add-on in a dbl-wythe brick exterior or seperation wall. ---
**Author:** ![cmisner](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cmisner/32/57038_2.png) [@cmisner](https://forum.nachi.org/u/cmisner)\ **Post date:** [April 12, 2019, 5:40pm UTC](https://forum.nachi.org/t/never-seen-this/151394/5 "2019-04-12T17:40:45Z")
What would the proper venting look like? ---
**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:** [April 12, 2019, 5:47pm UTC](https://forum.nachi.org/t/never-seen-this/151394/6 "2019-04-12T17:47:59Z")
> [@cmisner](#): > > What would the proper venting look like? That really depends on details of the home and sink location that we are not privy to at this time. Hopefully the OP will return and offer more pertinant details. ---
**Author:** ![cphipps2](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cphipps2/32/59937_2.png) [@cphipps2](https://forum.nachi.org/u/cphipps2)\ **Post date:** [April 12, 2019, 6:14pm UTC](https://forum.nachi.org/t/never-seen-this/151394/7 "2019-04-12T18:14:53Z")
The home has a septic system as well… ![DSCF0171](https://global.discourse-cdn.com/internachi/original/3X/e/5/e5b2e5743542cba5b2938b5d7c8e45af8572e098.jpeg) ---
**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:** [April 12, 2019, 6:56pm UTC](https://forum.nachi.org/t/never-seen-this/151394/8 "2019-04-12T18:56:30Z")
> [@cmisner](#): > > What would the proper venting look like? Now that the OP posted a photo, it would/should look like the photo that I posted. ---
**Author:** ![cmisner](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cmisner/32/57038_2.png) [@cmisner](https://forum.nachi.org/u/cmisner)\ **Post date:** [April 12, 2019, 9:24pm UTC](https://forum.nachi.org/t/never-seen-this/151394/9 "2019-04-12T21:24:26Z")
That’s what I thought. ---
**Author:** ![rlewis5](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rlewis5/32/337040_2.png) [@rlewis5](https://forum.nachi.org/u/rlewis5)\ **Post date:** [April 12, 2019, 10:49pm UTC](https://forum.nachi.org/t/never-seen-this/151394/10 "2019-04-12T22:49:18Z")
Or with an aav. ---
**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:** [April 13, 2019, 1:19am UTC](https://forum.nachi.org/t/never-seen-this/151394/11 "2019-04-13T01:19:56Z")
> [@rlewis5](#): > > Or with an aav. If allowed in their area, but I prefer the system shown in the photo. No maintenance unless there are problems. AAV’s have a short expected lifespan… 3-5 years. How many people change them before they fail? Zero. Zip. Nada. ---
**Author:** ![mbruns](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mbruns/32/57038_2.png) [@mbruns](https://forum.nachi.org/u/mbruns)\ **Post date:** [April 13, 2019, 3:26am UTC](https://forum.nachi.org/t/never-seen-this/151394/12 "2019-04-13T03:26:56Z")
What you are looking at is what is called a “LOOP VENT” The illustration above is what you are looking at. Sometimes this is the only way to vent in and island or where there is no other option to get it up a wall. These are except able according to code. I’ve have some plumbers call it a wet vent but that’s a whole other subject. ---
**Author:** ![cevans](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/cevans/32/244194_2.png) [@cevans](https://forum.nachi.org/u/cevans)\ **Post date:** [April 13, 2019, 5:17am UTC](https://forum.nachi.org/t/never-seen-this/151394/13 "2019-04-13T05:17:39Z")
> [@mbruns](#): > > These are except able according to code. You won’t find anything called a “loop vent” in the codes. ---
**Author:** ![rlewis5](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/rlewis5/32/337040_2.png) [@rlewis5](https://forum.nachi.org/u/rlewis5)\ **Post date:** [April 13, 2019, 1:22pm UTC](https://forum.nachi.org/t/never-seen-this/151394/14 "2019-04-13T13:22:30Z")
> [@jjonas](#): > > AAV’s have a short expected lifespan… 3-5 years Nope! Where did you get that from? ---
**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:** [April 13, 2019, 3:29pm UTC](https://forum.nachi.org/t/never-seen-this/151394/15 "2019-04-13T15:29:46Z")
> [@rlewis5](#): > > Where did you get that from? Everywhere!! ---
**Author:** ![mbruns](https://sea2.discourse-cdn.com/internachi/user_avatar/forum.nachi.org/mbruns/32/57038_2.png) [@mbruns](https://forum.nachi.org/u/mbruns)\ **Post date:** [April 18, 2019, 6:40pm UTC](https://forum.nachi.org/t/never-seen-this/151394/16 "2019-04-18T18:40:03Z")
[Scan2019-04-18\_123558.pdf](https://global.discourse-cdn.com/internachi/original/3X/9/6/96f6ec15f0599b4279cda6f87fae4384d1f81682.pdf) (1.4 MB) Here you go, great book for and inspector to have in his library to reference