Garage sink drain tie in

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Chris Harrington, Jan 16, 2020.

  1. Chris Harrington

    Chris Harrington New Member

    Joined:
    Jan 16, 2020
    Location:
    Delaware
    Hello - I am a recent lurker and thankfully for the knowledge contained within this site.

    I am placing a utility sink in my garage and plan to run the drain into my basement to tie in the drain. Can I tie into an existing 2” drain line which drains my master bathroom sinks? This existing drain then ties into a 3”.

    My plan was to tie into the drain by adding a 2” WYE (yellow in picture), then 45 elbow and 2 90s over to the wall adjacent to the sink in the garage. In the garage then have AAV. Is the AAV advises or not needed?

    As you can see I have already started dry fitting my plan but would like to make any adjustments suggested prior to glueing it up.

    Thank you in advance for feedback.
     

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  2. James Henry

    James Henry In the Trades

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    Occupation:
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    Location:
    Billings, Montana.
    It's OK to tie into the drain horizontally to avoid going through the joists. Use an AAV on both sinks.
     
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  4. Chris Harrington

    Chris Harrington New Member

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    This was my first thought when I first started my research. To tie into the 3” main. But there is no room to work with at the clean out. Maybe 1/8” access between the 3” WYE and the clean out. I suppose cut off clean out, add linked adapter, add another 3” WYE and run to sink in garage then replicate clean out after new WYE.
     
  5. Chris Harrington

    Chris Harrington New Member

    Joined:
    Jan 16, 2020
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    Delaware
    Here is a quick attempt of a sketch for what I originally proposed.
     

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  6. Chris Harrington

    Chris Harrington New Member

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    Oh so go into the vertical coming down from the sinks in master. Interesting.
     

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  7. James Henry

    James Henry In the Trades

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    Jul 23, 2019
    Occupation:
    Plumber
    Location:
    Billings, Montana.
    lay wye on its side.
     

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  8. Chris Harrington

    Chris Harrington New Member

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    Jan 16, 2020
    Location:
    Delaware
    That was exactly my thought. I should have been more clear and laying it sideways. Thank you. So this would work. Perfect. My wife trust me in most of my projects but I can sense her uneasiness with me cutting into perfectly good drain mains. So I figured it couldn’t hurt to ask around to confirm.
     
  9. James Henry

    James Henry In the Trades

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    Jul 23, 2019
    Occupation:
    Plumber
    Location:
    Billings, Montana.
    Your fine with that. I take it the toilet is on a different drain or it has its own vent. because that lav wouldn't qualify as a wet vent.
     
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  10. hj

    hj Moderator & Master Plumber Staff Member

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    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    In your case. almost any pipe you connect to will be okay. If you want to go into the 3" a male adapter and a 3x2 street/spigot tee will do the job, with a new cleanout into it, using a street/spigot female adapter and plug.
     
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  11. Chris Harrington

    Chris Harrington New Member

    Joined:
    Jan 16, 2020
    Location:
    Delaware
    Correct, the lav and shower are on the opposite side of the master bath and not tied into the sinks.
     
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