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Thread: Black Tanks Wont Flush

  1. Print this Post   #11
    Junior Member
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    Re: Black Tanks Wont Flush

    Quote Originally Posted by danemayer View Post
    I think on the manufacturing floor I've seen one behind the wall of the 1/2 bath. But I don't think there's an access panel at that location. You might take out some screws holding that corner of the front section of coroplast and see if you can spot anything above. If yes, then you might add an access panel at that location.
    Thank you!

    - - - Updated - - -

    Quote Originally Posted by jbeletti View Post
    Another thought is to expose the back of the UDC, identify the black tank flush lines (usually white-vinyl hose) and see of you can sort of follow where the 2 lines go.
    Thank you!

  2. Print this Post   #12
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    Re: Black Tanks Wont Flush

    Quote Originally Posted by danemayer View Post
    If you take down the rear wall of the pass through basement storage, by the Universal Docking Center (UDC), you can check the plumbing connections on the back of those flush connections. There should be PEX tubing from each connection, going up to the height of your shower where each tube connects to an anti-siphon valve. The PEX coming out of the anti-siphon valve then goes down to its respective black tank.

    For water to come out of the 2nd fitting when fed into the first, it sounds like the fittings are cross-connected. But for water to not go through the 2nd fitting, it sounds like the PEX tubing to the tank may be pinched.

    Anyway, you, or someone else will need to examine the fittings and PEX tubing.

    Attachment 64909
    Thank you.

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