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Thread: Black water tank flush

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    Junior Member
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    Black water tank flush

    We just bought a Newport landmark 365 2021. We can't figure out what is going on with the black tank flush, maybe someone could steer us. There are two ports as we have two bathrooms. When we put the hose on to one the water comes right out the other. Anyone know what might be up with that or what we need to do? It seems like it should be so simple. Also, anyone with two bathrooms, is tank #1 upstairs on downstairs. There is no manual that gives us anyone sort of information.
    thank you!

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    Prolifically Gabby Member JohnDar's Avatar
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    Re: Black water tank flush

    Not sure why they are interconnected, but it sounds like they’re missing one or both check valves at the fitting. The OEM parts are cheap plastic junk.


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    Senior Member
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    Re: Black water tank flush

    I assume it's still under warranty? Let the dealer figure it out.
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    Director of Owners Interests, Heartland RVs jbeletti's Avatar
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    Re: Black water tank flush

    Sounds like the black tank flush was plumbed wrong. If chasing this is not your thing, I'd let the selling dealer sort it out.
    Jim Beletti


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    Senior Member Jesstruckn/Jesstalkn's Avatar
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    Re: Black water tank flush

    I have seen this before on another Landmark.

    Your anti siphon valves are plumbed wrong.

    They are behind the wall of the shower.

    This is how this guys tanks were plumbed


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    Senior Member Jesstruckn/Jesstalkn's Avatar
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    Re: Black water tank flush

    Sorry for the horrible images but I'm doing it on my phone.

    This is how it should be

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    The Jess's
    Jerrod & Rhonda
    Zoey (Our Princess of the Palace)
    2015 Landmark 365 Ashland (Project LM 365)
    2020 Ford Super Duty F450 Limited

    Link to my 2015 Landmark 365 Ashland Modifications





  7. Print this Post   #7
    Junior Member
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    Re: Black water tank flush

    Quote Originally Posted by Jesstruckn/Jesstalkn View Post
    Sorry for the horrible images but I'm doing it on my phone.

    This is how it should be

    Sent from my SM-N950U using Tapatalk
    I have found one anti siphon behind the shower. Where may the other be located?? Thank you

  8. Print this Post   #8
    Prolifically Gabby Member JohnDar's Avatar
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    Re: Black water tank flush

    The second one should be somewhere near and above the tank for it. If you can access the tank, you should be able to see the water lines for it. They don’t always put them in an accessible location. In a blind wall cavity behind the toilet is one area they like to hide them. DAMHIKT


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    John & Darlene (with feline fuzzbutts Ally, Merlin & Mickey)
    2009 GMC 3500HD SLT CC D/A DRW
    2009 Bighorn 3670RL (sold 2020 and not replaced)

    H.O.C. #1225

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