Need Help With Sink Drain... Please!

Discussion in 'Plumbing Systems (The Fresh, The Blue, The Grey, &' started by jwh92020, Jul 10, 2018.

  1. jwh92020

    jwh92020 Member

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    Aug 24, 2014
    I'm building a small trailer with no holding tanks. It will only have a sink in it. What fittings are used through the wall and on the outside of a pop up to get from sink drain to hose connection? I'm going to use a p trap under the sink, but I don't know that connector to buy tho be able to transition from drain pipes the drain hose. Any help will be greatly appreciated.
     
  2. Sjm9911

    Sjm9911 Well-Known Member

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    Nj
    The outside of my pop up has a 1 1/2 pvc pipe thread, from there some get a 1 1/2 to garden hose reducer. It reality I want to make my line bigger, so it's up to you what you want to do.
     
  3. Raycfe

    Raycfe Waterford Ct.

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    Waterford, Ct
    Why use a p-trap, the gray water will be collected in a bucket etc on the outside of the camper. I used the largest sink basket/drain assembly (1 ½ inch) and a smooth interior hose with a gentle bend to a 1 ½ barb fitting to the outside. Simple and free flowing. A p-trap would be needed to control order from a sewer connection.
     
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  4. Sjm9911

    Sjm9911 Well-Known Member

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    May 31, 2018
    Nj
    That's a good point! Lol, I wouldent have even thought of it.
     
  5. jwh92020

    jwh92020 Member

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    Aug 24, 2014
     
  6. jwh92020

    jwh92020 Member

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    Aug 24, 2014
    I want to use the p trap because I want the ability to drain to a sewr connection if the situation arises.
     
  7. jwh92020

    jwh92020 Member

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    Aug 24, 2014
     
  8. jwh92020

    jwh92020 Member

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    Aug 24, 2014
    That is what I thought my old one (8 years ago) had, but the memory isn't what it used to be. Thanks.
     
  9. xvz12

    xvz12 Active Member

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    New Plymouth, ID
    When I redid my sink, I used one of these instead of a p trap <click here>
    Then, I made a p trap from pvc fittings & a hose bib that screwed on to my outlet on the outside of the trailer, easily attached & removed, & my sink drains like a dream.
    I have pics of the p trap made of pvc elbows here on the forum *somewhere*, but darned if I can find that post. Update: I found the pic:

    p-trap.jpg
     
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  10. David Blackwell

    David Blackwell New Member

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    May 10, 2017
    I recently learned, albeit the hard way, that my Aliner has a one way check valve to prevent odor from entering the living area that you may find useful. See https://hepvo.com. I thought I had adequately drained my gray water kitchen sink tank. Turns out it was larger than I had measured.* In trying to resolve my slow sink drain issue I asked Aliner for more information on the plumbing system. Aliner responded in two days with a helpful response. Not sure if other manufacturers are embracing the product but the Hepvo website has a few videos that may help your project. Good luck!

    * Aliner Explorer tank capacities
    Sink 13 gallons
    Shower 13 gallons
    Black 9 gallons
     
  11. Raycfe

    Raycfe Waterford Ct.

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    Oct 3, 2007
    Waterford, Ct
    Put it on the outside . The PVC doesn't even need to be glued to the camper when you want to use it. Just twist it on and you are good to go. You can even interchange the adapters for the hose at the end.
     
  12. jwh92020

    jwh92020 Member

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    Aug 24, 2014
    That is a nice looking set up.
     
  13. jwh92020

    jwh92020 Member

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    Aug 24, 2014
    I forgot about the Hepvo vent. My trailer sits up high enough that I could run a straight line with a Hepvo in it down through the floor, then turn it out to the side of the trailer. Hmmm...
     

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