Basement sink drain and vent identification

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by jwarda052, Jul 19, 2010.

  1. jwarda052

    jwarda052 New Member

    Jul 19, 2010
    A few years back, when building our house, we asked the plumber to rough in a sink drain in the basement for a future wet bar. Now I am doing the wet bar and noticed that there are two 1-1/2" pipes coming out of the slab, about two feet apart. I assume that one is a drain and one is a vent, but since they are not marked such, I cannot determine which is which. The only difference that I can tell is how the plumber capped them. One has a normal glued on cap, the other has what I believe to be a dishwasher fitting (see picture) and coupling that were fit without glue. Since I have lost track of the plumber, my hope is that this is some standard way of identifying the vent. Short of this, is there some other way of telling which is drain and which is vent? If not, how do you suggest I proceed?

    Thanks in advance,

    vent or drain.jpg
  2. Terry

    Terry Administrator Staff Member

    Aug 17, 2004
    Bothell, Washington
    He may have had something like this in mind.

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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    The only way to tell WHAT the two pipes were intended for would be to look into them and we cannot do that from here.
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