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Thread: Washing machine and utility sink tie in question

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  1. #1
    DIY Junior Member dannyd38's Avatar
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    Default Washing machine and utility sink tie in question

    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 by dannyd38; 02-11-2010 at 06:56 PM.

  2. #2
    DIY Member export!'s Avatar
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    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.
    IANALP
    (I Am Not A Licensed Plumber)

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    DIY Junior Member dannyd38's Avatar
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    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 by dannyd38; 02-11-2010 at 10:09 PM.

  4. #4
    Plumber Cass's Avatar
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    The washer requires a trap and vent as does the sink...the 3" copper line is not a vent it is a waste line....

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    DIY Junior Member dannyd38's Avatar
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    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?

  6. #6
    DIY Junior Member dannyd38's Avatar
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    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!

  7. #7
    Plumber jimbo's Avatar
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    Quote Originally Posted by dannyd38 View Post
    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.

    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.

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