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Old 03-02-2014, 11:01 AM   #11
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Okay Donna, we're thinking of about the same thing. Two notes on your photo example:
  • I don't think a P-trap against the wall would make much difference to usable storage space, but the Hepvo would work, too.
  • that tee probably won't flow very well, and will tend to send waste water to the other sink before the drain; why not route one sink drain straight back, and Y the other one into it? This is probably not a big deal.
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Old 03-02-2014, 11:07 AM   #12
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I'm certainly not a plumber, photos from the WWW. I just was posting that info for those that decided a double sink would cause problems with storage, when I know it doesn't have to be that way and there are off the shelf solutions. I know one of Larry Gamble's most asked for mods is the hepvo, so water never backs up into sinks/showers when the gray water tank is full. Win, win, win.
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Old 03-02-2014, 11:30 AM   #13
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I'm certainly not a plumber, photos from the WWW. I just was posting that info for those that decided a double sink would cause problems with storage, when I know it doesn't have to be that way and there are off the shelf solutions.
That makes two of us!
I do my own plumbing, but I'm not the expert... just a guy who has spent a lot of time in plumbing aisles to find the right thing to make an installation work. There are a lot of pieces out there, and they can be configured in many ways, many of which are not right.
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Old 03-02-2014, 12:27 PM   #14
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Quote:
Originally Posted by Donna D. View Post
I'm certainly not a plumber, photos from the WWW. I just was posting that info for those that decided a double sink would cause problems with storage, when I know it doesn't have to be that way and there are off the shelf solutions. I know one of Larry Gamble's most asked for mods is the hepvo, so water never backs up into sinks/showers when the gray water tank is full. Win, win, win.
Where does the grey water go then?
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Old 03-02-2014, 12:39 PM   #15
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Where does the grey water go then?
Outside, overflow tube or vent. Obviously needs to be installed
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Old 03-02-2014, 04:23 PM   #16
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Where does the grey water go then?
Usually the grey water coming up the shower is just a problem when driving around with a full (but not overflowing) grey tank, so there isn't any extra to go anywhere... it stays in the tank and attached piping, and just doesn't slosh into the shower. The other solution (other than the Hepvo) to this is a manually operated waste valve between the shower drain and the tank, as used on some other brands of egg. This is unpleasant if you forget to close it and drive with a full tank, or forget to open it and take a shower.

If you do actually slightly overfill the grey tank, it will come out the lowest place it can find (we have hit that occasionally in our motorhome, when it comes up into the shower). The drain piping will fill up right to the sink, which obviously wouldn't drain anymore so you will stop adding. Any vent should be above the sink (just as in a building) so the level should never reach there. If "cheater" vents with one-way valves are used under the sink level, that's putting a lot of faith in the valve to hold the waste water in; they are really just supposed to let air in, and not let gasses out.
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Old 03-02-2014, 04:46 PM   #17
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I'm most familar with the vent Gene put into the gray water tank of his Casita and Larry does it as part of the fast gray draining mod. As soon as the water reaches the top of the tank, it will flow to the outside. And because there's a vent, the air is pushed to the outside as water fills the tank. There's a 21 page thread on the Casita forum, if you're interested.
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Old 03-02-2014, 05:23 PM   #18
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There is a vent, but it is up about midway up above the floor level, though this would be lower than a backed up sink. The shower has a plug that pretty much stays in ours all the time, and just pulled the few times we use it.
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Old 03-02-2014, 07:59 PM   #19
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I'm most familar with the vent Gene put into the gray water tank of his Casita and Larry does it as part of the fast gray draining mod. As soon as the water reaches the top of the tank, it will flow to the outside.
That's called an "overflow", and overflowing directly outside when the user doesn't even realize it - and may just continue to use the sink or shower indefinitely - certainly does not seem like a responsible design. If you fill a tank set up this way - just short of overflow - and start towing it will likely slop waste water out the overflow port as soon as you turn a corner.

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And because there's a vent, the air is pushed to the outside as water fills the tank. There's a 21 page thread on the Casita forum, if you're interested.
There should always be a vent to allow proper drainage down the waste pipes, and as Jim described there is one in an Escape. The vents (one each for grey and black waste tanks) exit through the roof in my 1979 Boler, 2003 stick-built fifth-wheel, and 2010 motorhome... this is not a new RV feature.

I didn't find the Casita thread (in Casita Forum), despite Google searching for keywords such as "fast drain", so I'll just assume that a Casita comes with improper venting from the factory, and this is one of the things that Casita owners commonly do to fix the trailer to be properly usable.
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Old 03-02-2014, 08:07 PM   #20
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....I didn't find the Casita thread (in Casita Forum), despite Google searching for keywords such as "fast drain",...
Fast Gray Draining - CasitaForum
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