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Old 12-31-2014, 11:33 PM   #1
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Default Dual Dump Setup: Macerator & Gravity Dump

I have purchased a 4-leg wye and modified one leg to take a standard sewer hose and cap. This 4-leg wye is on the newer Roadtreks, but has a threaded plug for emergency tank draining. I modified this leg, because I thought unthreading the plug would be a very messy event. This leg will have an RV drain cap with a small garden hose fitting. I think the garden hose fitting cap can be removed quickly and drain hose attached to drain off the liquid. I am waiting until I need to service the pump before replacing the existing 3-leg wye.

I am curious what others have done, particularly Booster as you have mentioned a dual dump system in your macerator topic.

Thanks,

Pete
2006 Roadtrek 210 Popular
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Old 12-31-2014, 11:57 PM   #2
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

I am trying to take the dual dump setup to a true dual that you can use either the pump or gravity without any changeover that is more than normal use.

Our 07 has the same 4 way tank/valves fitting that you got, with the threaded plug in the outboard 2" leg. I may put a valve on that leg as long as I have it all off, aimed at 90*, but don't intend on really using it for dumping under any case.

Right now it looks like I will use the 4 way as is, with the same rubber coupling on the outlet of the 4way. Stock, the next fitting is a reducer to 2", then a rubber coupling, then the pump. We will have, instead of the reducer, a 3" wye fitting that one leg goes straight through to an added 3" valve and a then a standard gravity dump system over to the drivers side of the van. The other leg of the 3" wye will angle to the front, then use the 2" adapter to a 45* fitting, then the rubber coupling and pump. The pump outlet will go to the stock hose setup we have now.

The macerator setup should work exactly like stock does now.

If the pump fails, all you would need to do to gravity dump would be to extend the gravity hose and open the added valve. It would then be just like a factory gravity dump setup.

If it all works, out, it should be very versatile.

I have nearly all the parts on hand now, but still need the extra valve and hubs, gravity hose and tube, and need to make the new mountings.

I would guess it should be all done in 2-3 weeks when all of it gets here, and I will get a full set of pix put up on the forum.
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Old 01-01-2015, 03:04 AM   #3
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

Are you installing a blade slide valve with your gravity dump? It is best to have a bayonet cap that you can take off then hook up your 3" slinky hose before opening the valve. I don't know if it will help your particular situation but you ought to go out to Lake Region RVs and look at a new Great West Van. They are set up to dump via macerator or their traditional gravity way.

http://www.campingworld.com/shopping/it ... seals/6382
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Old 01-01-2015, 04:31 AM   #4
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

You guys do know about this fitting, right?

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Old 01-01-2015, 09:58 AM   #5
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

Quote:
Originally Posted by Davydd
Are you installing a blade slide valve with your gravity dump? It is best to have a bayonet cap that you can take off then hook up your 3" slinky hose before opening the valve. I don't know if it will help your particular situation but you ought to go out to Lake Region RVs and look at a new Great West Van. They are set up to dump via macerator or their traditional gravity way.

http://www.campingworld.com/shopping/it ... seals/6382
Yep, the intent is to have a 3" slide valve before the slinky connection. I also hope to be able to leave the slinky connected all the time similar to the gravity dump Roadtreks used to do, with the slinky self-storing inside a larger rigid tube that hinges down to come out under the low skirting when needed. The bayonet cap would go on the end of the slinky.

My largest concern would probably be how often the extra valve would have to be "exercised" to make sure it doesn't stick too badly. Hopefully, a flush of both systems at the end of trips will be plenty.
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Old 01-01-2015, 10:05 AM   #6
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

Quote:
Originally Posted by avanti
You guys do know about this fitting, right?

That is the 4 way fitting double valve setup that is in our Roadtrek and will remain in place. It is probably the one Peteco has also that he is going to put in. The stuff I am adding and moving goe right after that fitting.

The cleanout, or emergency dump, would be the 2" port on the outboard side. It is nearly impossible to get an easy connection into the port, at least on a Chevy 190, and I think impossible to get a decent valve there, so emergency dumping would be a pain. You would have "water" on the ground every time you hooked up, to some extent.

I am sure ours will be a bit of overkill, but as long as I was at it, I wanted to see if true dual capability was possible, and practical.
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Old 01-01-2015, 03:32 PM   #7
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

Yes, that is the 4-way fitting I have. I modified the emergency clean out leg to take a standard RV sewer fitting. I have not installed it yet so I hope it fits.

Pete
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Old 01-01-2015, 04:17 PM   #8
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

Quote:
Originally Posted by peteco
Yes, that is the 4-way fitting I have. I modified the emergency clean out leg to take a standard RV sewer fitting.
I guess I am confused by what you mean by "a standard RV sewer fitting." Isn't that (a bayonet connector) what the downward-pointing branch is? [not arguing, just curious].
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Old 01-01-2015, 05:32 PM   #9
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

Quote:
Originally Posted by peteco
Yes, that is the 4-way fitting I have. I modified the emergency clean out leg to take a standard RV sewer fitting. I have not installed it yet so I hope it fits.

Pete
2006 Roadtrek 210 Popular
There is very little space for anything on the cleanout side, at least on our 07 Chevy 190. The only real space you have is to the rear of the van, as the grey tank is cut away there, so you would need a 90* right out of the cleanout, and then another 90* pointing down. The 3" hoses are pretty big and probably wouldn't work very well, but you might get by with a 2".

I just came in from the shop after getting the van higher and level, so I can get a good check on road clearance for however I wind up doing it. Right now it looks like if I make my own adapter fitting to the pump, I many be able to move it all the way to the passenger frame rail, parallel with the grey tank valve.

I will run out and take a picture of the fitting you have and the room around it, as ours is still in place.
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Old 01-01-2015, 05:50 PM   #10
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Default Re: Dual Dump Setup: Macerator & Gravity Dump

Here is picture from below of the area in question. This fitting has the Roadtrek installed threaded bushing so it sticks out about 3/4" or so further than just the hub would.



Without the threaded bushing to the female hub edge is about 3"

There is about 3/4" above the hub to the tank

It is about 7" from the centerline of the hub diameter to the tank, to the rear.

Most of the fitting is higher than the bottom of the tank, some hangs below, but not much

One big problem could be that this is the lowest road clearance on the van, so whatever you do can't be more than about 3/4" below the hub bottom (even with the big valve), or it will likely get hit, if it is permanent.

If I were to use this spot, I think I would use a glue in 2" elbow to the fitting aimed to the rear, a little pipe to the rear, and a 2" elbow pointing down, with a threaded bushing in the elbow to screw in a fitting to hook up the emergency dump hose, which then could be any size.
Attached Images
File Type: jpg cleanout clearance.jpg (36.1 KB, 694 views)
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