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Old 10-12-2018, 08:20 AM   #1
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Fixed Tank Flush Supply

Just thought I would post my take on a more convent MOD to the water hookup for the black tank flush. You can see that I added a T going to the hose reel. You can see the lower brass fitting is the factory installed SharkBite check valve. After the T I put in a another SharkBite check valve to prevent contamination from the black tank. Installed in line is the black SharkBite ball valve. As it turns out I may replace the plastic valve with a brass SharkBite valve as I have had some leaking issues in other locations with the plastic ones. Systems works great.
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Old 10-12-2018, 08:22 AM   #2
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Ill correct myself. The T goes to the whole house filter. It Id supplied by the hose reel.
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Old 10-12-2018, 09:26 AM   #3
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Looks good. I did the same thing while installing my pressure regulator in the wet bay. It's a lot easier to turn a valve than drag out another hose to flush.
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Old 10-12-2018, 10:18 AM   #4
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I also did similar. In between the water hose reel and the water filter, I put in a water pressure gauge, water pressure regulator, shut off valve and backflow preventer. I did the T to the black tank rinse between the backflow preventer and the water filter and installed a shut off valve and another backflow preventer between the T and the black tank rinse input valve on the wet bay wall. All of the valves, gauges, regulator and backflow preventers are quality brass units.
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Old 10-12-2018, 10:38 AM   #5
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I also did this on my 2014 DS. Maybe Newmar should think about doing this. No need for a second hose and if you install it before the filter, you’re not shortening the life of the filter.
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Old 10-12-2018, 10:49 AM   #6
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Reason it isn't done is that it may be a build code rule that the fresh and black can not be connected regardless if you have a check valve. RVIA or some other trailer code.
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Old 10-12-2018, 08:44 PM   #7
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This mod has a phase II which am currently working on. Behind the control panel the supply hose crosses over to the passenger sid where I have a water softener. I am in the process of adding the Dave Bott mod for regeneration in place. I gonna tell you that the addition of the water softener is a major improvement to your water quality.
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Old 10-12-2018, 10:56 PM   #8
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I have been thinking about doing it also. Is it before the water filter or after? How does it affect the filter? Please post some pic's.
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Old 10-13-2018, 07:20 PM   #9
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Quote:
Originally Posted by TWINCAMSAM View Post
This mod has a phase II which am currently working on. Behind the control panel the supply hose crosses over to the passenger sid where I have a water softener. I am in the process of adding the Dave Bott mod for regeneration in place. I gonna tell you that the addition of the water softener is a major improvement to your water quality.


Im going to do the same thing. I was planning on putting the water softener on the drivers side, in the cabinet next to the oasis.
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Old 10-13-2018, 10:01 PM   #10
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My version.
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Old 10-13-2018, 10:25 PM   #11
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I would never make any kind of connection between my potable water system and the black water tank. After 40 years experience in designing, building and maintaining buildings and installed systems, utilities, etc, I do not recommend making any kind of cross connection regardless of valuing and or backflow prevention. Building codes do not allow it and I don’t know but, doubt RVIA allows it. Be safe rather than sorry as Murphy is alive and well.
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Old 10-13-2018, 11:12 PM   #12
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Quote:
Originally Posted by imgoin4it View Post
I would never make any kind of connection between my potable water system and the black water tank. After 40 years experience in designing, building and maintaining buildings and installed systems, utilities, etc, I do not recommend making any kind of cross connection regardless of valuing and or backflow prevention. Building codes do not allow it and I dont know but, doubt RVIA allows it. Be safe rather than sorry as Murphy is alive and well.
Interesting. When you are hooked up to water at a camp site you have only one source for rinsing the black tank. No matter how you hook it up that is the source you must use for the rinse. I used to have a tee with a dedicated hose going to the black tank rinse. I finally realized that there is really no difference between that system and the one in my picture, just hose length. 15 years later I seem to be alive and well.
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Old 10-14-2018, 06:29 PM   #13
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Jerry, glad you never had a problem. It is may not ever cause a problem, but it is against every code I know off. I may be too cautious but I use a separate hose only for flushing the black tank. I put it on the hose bib before and take it off after each flush. Also spray the hose bib with a bleach and water mix. Among other things, was responsible for providing potable water to a population of approx 12,000 people.
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Old 10-14-2018, 08:53 PM   #14
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Jerry, What is the purple filter for? a larger micron pre filter?
Thanks
Ernie
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