Washing machine and utility sink tie in question

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by dannyd38, Feb 11, 2010.

  1. dannyd38

    dannyd38 New Member

    Messages:
    5
    Location:
    Maryland
    I am going to frame a wall in the laundry room so all the plumbing is out of sight. I want to tie in a washing machine drain and a utility sink drain into the main stack. The stack is currently a 3" copper line that I will be changing over to PVC. Should I use a sanitary t or a wye when connecting to the vertical main stack? Can I use the main as a vent or should I use an air admittance valve? The washing machine will be to the left of the stack and the utility sink to the right. Thanks in advance for any help I receive.

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    Last edited: Feb 11, 2010
  2. export!

    export! DIY Member

    Messages:
    90
    Location:
    Ontario, Canada
    Wow #1 you need a P-Trap. I can't imagine it smells to great where that washer discharge enters. Then you can tackle venting for the two fixtures there.
  3. dannyd38

    dannyd38 New Member

    Messages:
    5
    Location:
    Maryland
    I understand everything concerning installing traps; I want to be sure to use the right fittings for the tie in. It smells fine, there is a rubber seal on top of the iron pipe preventing the sewer gas’s from escaping.
    Last edited: Feb 11, 2010
  4. Cass

    Cass Plumber

    Messages:
    5,980
    Location:
    Ohio
    The washer requires a trap and vent as does the sink...the 3" copper line is not a vent it is a waste line....
  5. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego

    That gray rubber piece is probably a splash guard, and is far from a seal. Regardless of whether you have odor or not, a trap is absoultely required by ALL codes. The washing machine standpipe is higher thatn allowed by code. An air admittance valve is not proper for a pumped waste source like a washer.
  6. dannyd38

    dannyd38 New Member

    Messages:
    5
    Location:
    Maryland
    I call it a waste stack/vent line because it was used to vent the sink that was there since 1968 without any issues. I know every fixture needs a trap and needs to be vented. In the original post I asked what fitting is recommend tying into the 3” stack a wye or a sanitary T? I also asked if I could use an air admittance valve to vent the washer and sink. Can someone please just answer the questions and not point out the obvious things in the picture? I know to use the fernco fittings when transitioning from copper to PVC I am just not sure if I should use a 3x3x2 wye or sanitary T?
  7. dannyd38

    dannyd38 New Member

    Messages:
    5
    Location:
    Maryland
    Thanks JIMBO!!

    So my only vent option is to go to the roof and tie into the main vent, now for the proper fittings to use and I should be set!
  8. Nate R

    Nate R New Member

    Messages:
    472
    Location:
    Milwaukee, WI
    SanTees should be used to connect horizontal into vertical, Wye Combos are for vertical waste into horizontal.

    Have you seen Terry's pic of proper rough plumbing of a washing machine standpipe? (Pic is work 1K words!)
    Good to see you asking questions like that BEFORE tackling the work! :)
  9. dannyd38

    dannyd38 New Member

    Messages:
    5
    Location:
    Maryland
    Thanks Nate!

    I will be using SanTees and I found Terry's pic, I will mirror Terry's pic and somehow vent it to the roof.
    Thanks for all the help!
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