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  1. #1
    Seasoned Camper Ivan S854's Avatar
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    Black tank flush vacuum breaker?

    Is there a vacuum breaker incorporated in the black tank flush?

    Currently I have a Y fitting at the campground water source with a fresh and a black supply line connected... I leave the male end of the black hose disconnected until it's time to dump... Then connect to the docking station with a plastic vacuum breaker between the hose and the trailer...

    Am I "double protected " this way?

    Also... I can only get one hose through the bottom hose port... Somehow I'm not too comfortable running one hose from the shore to the trailer, installing the Y inside the basement then having two short hoses leading to the fresh supply and black tank flush...

    Any suggestions?
    2005 Chevrolet 2500HD D/A CC LB 4WD
    2016 Reflection 303RLS
    VIN: 573FR332XG3305974
    2007 Ural GearUp Arctic

  2. #2
    Seasoned Camper gr8daggett's Avatar
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    Yes there is a vacuum breaker in the black tank flush line. Believe it is required by code.
    Typically a cheap plastic one that has leaked on every trailer I have had.
    In my 337 it is behind the shower controls. I removed the panel in the linen closet to find and monitor it.
    I replaced the leaky one in my 337 with a brass version... no leaks

    Click image for larger version. 

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    Mike
    Mike & Pat Clawson
    Marty & Bucky (Welsh Corgis)
    2015 Grand Design Reflection 337 RLS #2813
    Titan Disc Brakes, Liberty Rider Suspension
    2005 Chevy Silverado 2500HD Duramax/Allison
    Comfort Ride Hitch, 52 Gallon Titan XXL Fuel Tank, Banks Speed Brake, Firestone Air Lift Bags
    http://i1383.photobucket.com/albums/...pst4uyouma.gif

  3. #3
    Left The Driveway
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    Quote Originally Posted by gr8daggett View Post
    Yes there is a vacuum breaker in the black tank flush line. Believe it is required by code.
    Typically a cheap plastic one that has leaked on every trailer I have had.
    In my 337 it is behind the shower controls. I removed the panel in the linen closet to find and monitor it.
    I replaced the leaky one in my 337 with a brass version... no leaks

    Click image for larger version. 

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ID:	4444 Click image for larger version. 

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    Mike
    Can you repost pics they ate not loading

    Sent from my SAMSUNG-SM-N910A using Tapatalk

  4. #4
    Fireside Member
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    Great question. That must be the reason I have been getting the funky smell after flushing. I've been trying to run it down, but it was intermittent. Now I'll go on an adventure and find it. Love this GD forum!
    Jon & Lori - Clovis CA
    2015 Solitude 369RL #3825 " The Rock "
    2013 Chevy 3500 SRW, Duramax Diesel

  5. #5
    Setting Up Camp
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    I can not put water into the black flush inlet (in the control panel). I understand that when you can put water in ... to flush the black tank, you can hear the water swishing around, flushing the black water tank. Is there a valve setting that I am missing to have the water enter the black tank from a city water hose?

    Am I missing something? Or is some valve plumbed backwards?

    Any help out there???
    Dave & Becky
    2016 Reflection 303RLS
    2015 GMC Denali HD
    Yakima WA

    ENJOYING the GD Camper

  6. #6
    Seasoned Camper JustinThyme's Avatar
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    There is no valve, just the vacuum breaker. Connect water supply and turn on, done. It can be heard without question.

    @ RVMode, this has nothing to do with any "funky smell". A lot of folks make the mistake of having the exhaust fan on while flushing. This simply draws air right down the vent pipe through the tank and out in your face. The only thing this does is prevents back flow from the tank to the flush connection.
    2015 Reflection 323 BHS #589
    Still working Electrical Engineer
    Rob, Maureen, Dakota, Jacob and Murphy the Lab
    JustinThyme (Just In Time) is a forum handle

  7. #7
    Fireside Member
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    I also had a black tank flush that did not let water through. In the 303 it was almost impossible to get to with my large hands, so I could not replace it. I read on a forum for another brand of trailers that some were stuck to ot let water flow through and to place a vauum cleaner hose over the opening on the control panel for a very brief time. I tried that for 2 times with the vacuum hose completely covering the flush connection. I was skeptical, but it worked to unstick the parts immediately.
    Tom and Tanya
    Live in Alaska, currently winter in Texas Hill Country.
    303RLS

  8. #8
    Seasoned Camper gr8daggett's Avatar
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    pics

    Here ya go
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    Mike & Pat Clawson
    Marty & Bucky (Welsh Corgis)
    2015 Grand Design Reflection 337 RLS #2813
    Titan Disc Brakes, Liberty Rider Suspension
    2005 Chevy Silverado 2500HD Duramax/Allison
    Comfort Ride Hitch, 52 Gallon Titan XXL Fuel Tank, Banks Speed Brake, Firestone Air Lift Bags
    http://i1383.photobucket.com/albums/...pst4uyouma.gif

  9. #9
    Left The Driveway
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    Great post Mike, thanks for sharing the info.
    MikeK NY
    2016 Momentum 380TH
    2012 Ram 3500 Diesel Dually
    B&W 20K Companion
    2003 Road King

  10. #10
    Fireside Member IsaLei's Avatar
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    Quote Originally Posted by Soldotnatom View Post
    I also had a black tank flush that did not let water through. In the 303 it was almost impossible to get to with my large hands, so I could not replace it. I read on a forum for another brand of trailers that some were stuck to ot let water flow through and to place a vauum cleaner hose over the opening on the control panel for a very brief time. I tried that for 2 times with the vacuum hose completely covering the flush connection. I was skeptical, but it worked to unstick the parts immediately.
    I am going to have to try that. Twice I have tried to flush and do not hear of any water running / flushing tank. Nothing comes out of the dump side either
    Taj & Carmen (Counting the days...)
    2016 Reflection 29RS
    2016 F350 DRW Lariat FX4
    Discovery Bay Ca

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