Washing Machine Drain Connection

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Cooky, Oct 24, 2008.

  1. Cooky

    Cooky New Member

    Oct 24, 2008
    I am replacing a laundry tub with a standard counter and sink. I'd like to connect the washer discharge under the counter rather than hooking it over the side of the sink.

    We have a new High Efficiency washer and the drain hose is only 1 inch in diameter. Can I use a drain pipe connection similar to what my dishwasher uses in the kitchen?

    A second option may be to add a Y connection to the horizontal drain pipe coming out of the wall and then add a second p trap and a stand pipe under the counter. Then I can hook the washer discharge there.

  2. Dunbar Plumbing

    Dunbar Plumbing Master Plumber

    Apr 18, 2005
    Service Plumber, Outdoor Temperature Relief Owner
    Northern Kentucky/Greater Cincinnati Area
    Supposed to be an Air Break on any laundry equipment due to excessive flow.

    The high efficiency models are notorious for rapid flow in the drains.
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  4. Redwood

    Redwood Master Plumber

    Dec 15, 2007
    Service Plumber
    Some of the newest high efficency washers use very little water and the instructions for them state to set up the drain using a dishwasher tailpiece...
    If this is what you have you are presently in a la-la land where the code states a 2" standpipe is required but has not addressed the type of machine you have yet... As it stands asking a plumber may not even get you a clear answer because he probably hasn't seeN one of these machines yet..

    You have to make a choice here... You can go with the code compliant standpipe and your home will be set up for either the new machine or, the conventional machine and it will cost a bit more. Or, you can go ahead and hook it up via the dishwasher tailpiece as instructed in the washer installation manual and have a working unit but will not be code compliant as it is not yet addressed by the code.

    My guess is when it finally is addressed the hook up will be similar to what the state you are in allows for a dishwasher... High loop in the hose or, an air gap.

    Is this one of the machines that also dries?
  5. Southern Man

    Southern Man DIY Hillbilly

    Jun 27, 2008
    North Carolina
    What does the installation manual say?

    I think whatever you do you'll need an air gap, discharge above a certain elevation of the washer, and of course a trap. If the discharge isn't high enough then the washer will start to drain while it is filling. This problem gets worse with the new tall machines.

    I don't think a Y-tailpiece under a counter would work for two reasons. First I don't know if they make one that big and second the discharge may be too low.

    You may end up with a standpipe against the wall.
  6. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    ANY open drain, such as a standpipe, has the potential to overflow, and inside a cabinet would not be a good spot for it to happen.
  7. nhmaster

    nhmaster Master Plumber

    Jul 30, 2008
    Tech. Instructor
    S. Maine
    Stand pipe, 2" trap arm and trap, must connect to 3" branch line. Don't make no difference if it's high efficiency or not. Code says nothing about "high efficeincy" Dump it into the sink, save yourself the hassle.
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