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Old 01-28-2017, 10:41 PM   #1
1 Rivet Member
Gilbert , Arizona
Join Date: Aug 2016
Posts: 18
toilet mount not directly above black tank?

Im in the middle of a gutted trailer renovation and don't have a great spot for the toilet to go that would be directly over a black tank. the perfect location would be just to the outside of the frame rail. that would require a 90 degree or so bend to the toilet drain that leads to the black tank mounted just inside the frame rail. there is already a hole through the frame at this point. and previously this is how a toilet was mounted however no tanks or plumbing came with this trailer. the overall run of the line would be less than 6-8 inches id imagine. only a 2 inch or so frame rail.
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Old 01-28-2017, 10:57 PM   #2
Rivet Master
1995 25' Excella
xxxxx , xxxxxx
Join Date: Apr 2015
Posts: 1,883
My toilet is not directly over the tank. My toilet is on a wooden box pedestal. The toilet flange has an elbow on it and then a 4 to 6 inch piece of straight pipe that goes into the tank.
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Old 01-29-2017, 05:24 AM   #3
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1989 34.5' Airstream 345
Ebro , Fla Panhandle
Join Date: Jul 2013
Posts: 1,204
The set up in my 345 motor home is like CRH describes, the elbow seems to be about a 60 degree turn, and works fine. I would think having some fall/downward slope in all sections the line would be a good idea.

Cheers Richard
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Old 01-29-2017, 08:34 AM   #4
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2006 23' Safari SE
Biloxi , Mississippi
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Alternatively you could go with a quality composting toilet and do away with the black tank.

Do you know what a learning experience is? A learning experience is one of those things that says "You know that thing that you just did? Don't do that."
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Old 01-29-2017, 09:41 AM   #5
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2014 27' FB Eddie Bauer
Chelsea , Michigan
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In my opinion, an elbow like that would cause problems with material movement. At a minimum you would need to use a whole lot more water when flushing which will make camping without water & sewer hookups less enjoyable. If you must have such an arrangement, I would #1 consider a composting toilet, or #2 look into a macerating toilet which will break down the solids and make it easier to move them to where you want them to be.
Bob Martel
WBCCI# 5766
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Old 01-29-2017, 09:45 AM   #6
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Gainesville , Florida
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Push the pettle part way down and fill the toilet a couple of inches or more, this facilitates the waste to go on down. My Avion needs to have this done to flush properly.
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Old 01-30-2017, 04:31 PM   #7
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Sonoma Co. , California
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As Richard states, a small downward slope of the pipe into the black tank is needed, and as CHR points out, mounting the toilet on a low pedestal will accomplish the desired slope. Happy plumbing!
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