Can I put a wye under my last cleanout in the basement?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Rizziot, Jul 24, 2021.

  1. Rizziot

    Rizziot New Member

    Jul 24, 2021
    Hi, I am trying to install a utility sink in my basement for a home brewery. I have very limited space and had originally planned to plumb into my kitchen stack that comes down the wall and into the concrete floor.

    The very last fitting on the stack is a 2" cleanout, and after setting my sink up it seems that I will not have enough height to be able to place the wye above it. Any code restrictions etc? I'm in Michigan.

    I thought of using a lift pump, but my house seems to only have 1 side vented. All of the sinks on the south west side of the house use studor vents. So when I read the manual for the lift pump it stated that no AAV vents were allowed...

    Any other ideas would be welcome.

    Thanks in advance!

    Attached Files:

  2. JJ44

    JJ44 New Member

    Jan 13, 2021
    Portland, OR
    I believe you can put a San-Tee when dumping into a vertical stack. Pretty much any time you have slow-moving (horizontal) dumping into fast-moving (vertical) you can use a San-Tee, otherwise you need the longer sweep when going from fast-moving (vertical) to slow-moving (horizontal). Knowing that: You may buy yourself a couple inches if you ditched the Wye for a San-Tee.

    As for your placement question: A quick google search tells me you are under IPC. Here's the bit about cleanouts:
    I didn't see anything about a clean out required to be last on a stack, and your fitting isn't changing the direction of the stack, so I don't think it would be a problem.

    I'm not sure about IPC, but if I recall UPC puts major restrictions on the use of those types of vents (Air Admittance Valves). You may want to search the IPC for the restrictions (if any) of their use.
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  4. WorthFlorida

    WorthFlorida The wife is still training me.

    Oct 28, 2009
    Orlando, Florida
    AAV's is a check valve that only allows air to enter a pipe. Using a pump in a housing creates positive pressure as water fills the sump, then a vacuum as the pump runs to drain it.

    You can move the clean out higher and use a San-Tee, not a wye with an AAV at the sink trap. I'm not a plumber, others will comment if I'm wrong.
  5. Rizziot

    Rizziot New Member

    Jul 24, 2021
    Thank you both!

    Should I place the San-Tee on the 45 degree PVC coming out of the floor (per the photo), or should i cut at the 90, install a new 90, then the San-Tee, then install the new cleanout above it?
  6. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    Coming off the vertical for the sink on the floor above, you can use a wye or a santee.
    The trap arm for the new sink in the basement will need to be vented after the trap. If using an AAV, at least four inches above the trap arm.

    A sewage ejector needs a vent through the roof for it to work properly, not an AAV.
    Jeff H Young likes this.
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