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Old 06-23-2016, 06:12 PM   #1
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Brand: Thor Motor Coach
State: Pennsylvania
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THOR #1537
Black tank drain too low

I always have issues dumping my tanks at most campgrounds due to the drain pipe being too low. Usually we have to walk the hose up a slight incline from the outlet.
There are pictures below.
I am thinking of raising it a bit and it looks like we have the room to go maybe 2-3 inches. It currently sits 3 1/4 inches off the ground at the outlet.
To raise it up I plan on replacing one of the 90 degree elbows and just rotating it a bit to get the angle I want.
The issue is with the grey tank connection. I'm not sure what to do there. Anyone have any ideas?

What is the grey sealant used to connect the reducer to the grey tank?

Passenger side next to black tank.

Different view of passenger side.

Driver side grey tank connection to outlet.

Span across motorhome from black tank.


Thanks in advance.
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Old 06-23-2016, 08:12 PM   #2
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THOR #3610
You'll need the find a source for ABS fittings which use ABS adhesive, ABS is not compatible with PVC.
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Old 06-23-2016, 08:31 PM   #3
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Brand: Thor Motor Coach
Model: 2013 31L
State: Florida
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THOR #908
yikes, that looks awful low!

How much ground clearance under that pipe do you have?

I'm nervous about mine being so "exposed" behind the rear axle/tires because a blowout would likely take it out.... as might running over some major "junk" in the road....
From those pictures, yours looks a lot worse!
I'd be doing the same thing that you are thinking!

good luck!!
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Old 06-23-2016, 08:43 PM   #4
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Brand: Thor Motor Coach
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THOR #1537
I have about 3-5 inches of clearance. The dump valve is the lowest point.

The plan is to cut out one do the 90 degree elbows and replace it with one that is rotated a bit higher. That should allow me to get a little closer to the frame to strap it. I am estimating a 4 inch gain in height.
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Old 06-23-2016, 08:59 PM   #5
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THOR #1249
Just a WAT here; looks as though your tanks are on passenger side and if so, may be easier to install your dump valve or valves on that side near the tank or tanks, and when dumping pull in with that side to dump drain. And when in campground for awhile, run a long hose under the chassis and to the drain. Just a thought to save some rigid piping and increase clearance if possible.
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Old 06-23-2016, 10:00 PM   #6
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THOR #908
If it's under warranty, I'd consider bouncing it back to the dealer to fix. That can't be 'right'
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Old 06-24-2016, 01:14 AM   #7
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THOR #1537
My tanks are on opposite sides, black on passenger and grey on driver side.
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Old 06-24-2016, 01:17 AM   #8
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Brand: Thor Motor Coach
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THOR #1537
The coach is still under warranty, but I can't find a local dealer to touch it. Even though I think it is an easy fix, everyone I have called said I would have to wait until fall to get it fixed.
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