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  1. #1
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    2 Grey tanks, and one Grey handle in Nautilus P1 newbie question

    Good morning all! Quick question. I have a 290BH 5th wheel. Nautilus P1 has 1 grey handle to main grey dump (bathroom sink/shower) , and 2nd Grey handle for kitchen sink is behind driver side wheels. My question is, when I dump rear tank behind wheels and the dump line is connected to the rear tank...do I have to pull the Grey handle on the Nautilus P1 panel also? Logic would tell me no, or I would have an open grey with no line connected...but I wanted to ask any of you if you know-is there a connection between the panel and the 2nd grey tank? Thanks, and go easy-I am a newbie!!! LOL
    2018 F350 Lariat SRW 8' Bed
    2019 Reflection 150 Series 290BH
    Hartland, WI
    Retired Army SGM

  2. #2
    Big Traveler Steve7's Avatar
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    Quote Originally Posted by mgosman+2 View Post
    Good morning all! Quick question. I have a 290BH 5th wheel. Nautilus P1 has 1 grey handle to main grey dump (bathroom sink/shower) , and 2nd Grey handle for kitchen sink is behind driver side wheels. My question is, when I dump rear tank behind wheels and the dump line is connected to the rear tank...do I have to pull the Grey handle on the Nautilus P1 panel also? Logic would tell me no, or I would have an open grey with no line connected...but I wanted to ask any of you if you know-is there a connection between the panel and the 2nd grey tank? Thanks, and go easy-I am a newbie!!! LOL
    I have a different model, but do have two grey tanks, two handles, but one outlet. Each handle works it’s own grey tank, and not the other.
    Steve & Sue (pups:Sky & Sierra) Gardnerville, Nv
    2017 Refelection 297RSTS
    2017 Ford 350 CC 4x4 Lariat Superduty 6.7, Long Bed

  3. #3
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    Thanks for the reply. I did quite a few searches on this and saw some models had both grey tanks that dumped through the one main outlet. My rear grey for the kitchen drains into a separate smaller drain rather than the main-which is why I logically think, pulling the handle for the main grey has nothing to do with the rear handle, but figured I better ask. Thanks again!
    2018 F350 Lariat SRW 8' Bed
    2019 Reflection 150 Series 290BH
    Hartland, WI
    Retired Army SGM

  4. #4
    Long Hauler DaveMatthewsBand's Avatar
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    We have 2 greys, each has their own handle and own outlet.

    So we have one dump outlet under the Nautilus with 1 black and 1 grey handle.

    There is a 2nd dump outlet in the rear under the kitchen next to the 2nd grey handle.


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  5. #5
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    Quote Originally Posted by DaveMatthewsBand View Post
    We have 2 greys, each has their own handle and own outlet.

    So we have one dump outlet under the Nautilus with 1 black and 1 grey handle.

    There is a 2nd dump outlet in the rear under the kitchen next to the 2nd grey handle.


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    Thanks @DaveMatthewsBand! It sounds like we have the same setup. So when you dump your rear (aux) grey tank, you don't also pull the grey handle at your Nautilus right? I ask because I couldn't seem to get my rear grey to read below 2/3 after dewinterizing this year. Water flowed out, but not nearly as fast as my main grey tank. So I wanted to make sure I wasn't doing something wrong when trying to dump my rear grey.
    2018 F350 Lariat SRW 8' Bed
    2019 Reflection 150 Series 290BH
    Hartland, WI
    Retired Army SGM

  6. #6
    Long Hauler DaveMatthewsBand's Avatar
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    Quote Originally Posted by mgosman+2 View Post
    Thanks @DaveMatthewsBand! It sounds like we have the same setup. So when you dump your rear (aux) grey tank, you don't also pull the grey handle at your Nautilus right? I ask because I couldn't seem to get my rear grey to read below 2/3 after dewinterizing this year. Water flowed out, but not nearly as fast as my main grey tank. So I wanted to make sure I wasn't doing something wrong when trying to dump my rear grey.
    Correct, each grey tank has its own dump valve and handle.


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  7. #7
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    My unit (2018 350M) has a gray tank and black tank controlled by the Nautilus and the dump/handle behind the axles is for the half bath and is gray/black together.
    2018 Grand Design Momentum 350M
    2018 Dodge Ram 4500 4x4 4 door flatbed Cummins Aisin 4.10s

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