What's this for?

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by HoracioO, Jul 14, 2010.

  1. HoracioO

    HoracioO New Member

    Joined:
    May 10, 2009
    Location:
    NV
    OK, inspecting a new building for ADA compliance and found this in on two of the washbasins. Now they cut into the protective wrap and it is forward facing hitting a chair user right below the knees... but it also just seems a weird thing... it's a tiny url link...


    http://tinyurl.com/2u8du69
     
    Last edited by a moderator: Jul 14, 2010
  2. Terry

    Terry Administrator Staff Member

    Joined:
    Aug 17, 2004
    Occupation:
    Plumber
    Location:
    Bothell, Washington
    That would be for priming the floor drain below.
    Without that, the p-trap water could evaporate.

    If you ever go into a public bathroom, and it smells badly, take a paper cup and fill the floor drains with water.

    Here is a picture of a p-trap with the inlet for the priming.

    [​IMG]
     
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  4. HoracioO

    HoracioO New Member

    Joined:
    May 10, 2009
    Location:
    NV
    Ahh Thanks Terry! It seems so much of an afterthought, oddly enough only one restroom had it in there despite this building having around 16+ restrooms.
     
  5. hj

    hj Moderator & Master Plumber Staff Member

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    It is a trap primer, although they are usually attached at the rear, not the front. and you only need one for each floor drain. Other drains may have different means of maintaining the trap's seal.
     
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