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Old 11-21-2020, 01:11 PM   #1
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One hose black tank flush. Safety through valves?

Seeing as I apparently like to play with little plumbing projects, I thought I'd try to come up with a technique to use the potable city water hose to also flush out the black tank. Here's what I came up with:
  • First there is a check valve near the flush device so theoretically no black water can get it's way back over to the wet bay.
  • The valves can be set to direct water to the city input or flush input
  • The city water circuit can be valve-isolated and the flush side can be set to drain what may still be in the flush circuit to a little hose directed to overboard
Does this seem safe? (if operated properly)

fwiw,
Paul
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Old 11-21-2020, 01:35 PM   #2
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Just my own opinion- I'd keep those separate. Just use 2 hoses. Maybe it's there but I don't see the back flow preventer in the picture.
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Old 11-21-2020, 02:29 PM   #3
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Where did you get those wye adapters? I need a couple of newer ones.
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Old 11-21-2020, 04:29 PM   #4
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Hi,
The wye valves are from the Amazon:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

They work well and are easier to move than the all bronze ones.
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Old 11-21-2020, 04:40 PM   #5
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Hose adapter s can be found at Lowes, Home Depot, Hardware stores or Amazon
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Old 11-21-2020, 05:16 PM   #6
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I added a grey tank sprayer and use just the incoming fresh water hose as my source for both it and my black tank flush. There is a back flow preventer in the line that feeds the black and grey valves that can be seen in the photo. There are two additional back flow preventers in each line that can't be seen.

This modification was done about two years ago and the DW and I are still alive.
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Old 11-21-2020, 05:26 PM   #7
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To many moving parts for me
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Old 11-21-2020, 05:34 PM   #8
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Works for me. There is a backflow valve as well in line behind the wet bay panel in line to the tank flusher.
No issues whatsoever.
Got tired of pulling out two hoses all the time. Before I installed this we didnt have a cap on the tank flush hose bib connector. Never had one drop of tank flush water come out of it.
I see no problem doing this upgrade. Obviously only open one valve at a time.
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Old 11-21-2020, 05:39 PM   #9
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Quote:
Originally Posted by BobGed View Post
I added a grey tank sprayer and use just the incoming fresh water hose as my source for both it and my black tank flush. There is a back flow preventer in the line that feeds the black and grey valves that can be seen in the photo. There are two additional back flow preventers in each line that can't be seen.

This modification was done about two years ago and the DW and I are still alive.

Nice looking set up there.
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Old 11-21-2020, 05:48 PM   #10
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Definitely need a backflow preventer unless there is one on the backside of the flush inlet. There should be one at the flush fitting itself too, but with just that one you can get standing water from the flush hose (from panel inlet to flush device) feed back into your city water fitting.

The wyes would be better if they are 100% brass. The ones you used actually advertise their lead content. (Although I think the mean “no more than”)

Regards,

Randy
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Old 11-21-2020, 06:39 PM   #11
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Quote:
Originally Posted by BobGed View Post
I added a grey tank sprayer and use just the incoming fresh water hose as my source for both it and my black tank flush. There is a back flow preventer in the line that feeds the black and grey valves that can be seen in the photo. There are two additional back flow preventers in each line that can't be seen.

This modification was done about two years ago and the DW and I are still alive.

BobGed. I like your setup. I can see the back flow preventer near the bottom but where is the one in the line to flush connection? Should it be before or after the in line valve going to the flush connection? I want make an arrangement like yours this winter.
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Old 11-21-2020, 06:45 PM   #12
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BobGed
Where is #1 in the picture going, do you have two tanks this is flushing? And is #2 a drain valve? Click image for larger version

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Old 11-21-2020, 07:40 PM   #13
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You guys have way too much time on your hands? But I like it.
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Old 11-21-2020, 08:51 PM   #14
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If you guys can understand my contraption feel free to critique it. The block and bleed goes to the blank tank ... the line with the pressure regulator goes to city water and the line with the valve goes to the car washing hose.
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