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Old 02-18-2020, 02:09 PM   #1
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Brand: Thor Motor Coach
State: Florida
Posts: 1
THOR #18124
Gray water tank comes loose from dump valve fitting

I have a 2018 Thor Quantum RW28. The gray water tank is connected via a series of rigid adapters to the gray water dump valve. The fittings don't exactly line up so they're " force aligned" (about 1/2 inch) to the dump valve. The series of adapters keeps coming loose from the dump valve, I assume due to road vibration.

The sewer line runs across the coach and under the driveshaft, so I can't raise it any and it is already the lowest point on the vehicle. It is subject to damage when driving over even the slightest bump, like speedbumps or potholes.

I have tried to add additional hangers to the sewer line, but have limited options for attaching the hanger straps to the frame.

The series of adapters consist of:
a. adapter to reduce tank drain to 1.5 inch pipe
b. 1.5 inch 1/4 bend street adapter that connects to the top of the gray water valve. (the connection between this adapter and the valve keeps detaching)

Anybody else have this problem and come up with a solution?
Thanks!
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Old 02-18-2020, 03:25 PM   #2
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Brand: Thor Motor Coach
Model: Citation
State: Texas
Posts: 393
THOR #8139
Evidently Thor was out of glue the day they built your mh, hardware stores have pvc glue.
or
IF we had your setup I would cut ALL that out from under the mh. Then take the valve and fittings apart and reuse to mount the valve at the tank, buy more slinky hose and run it under/around the mh.
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Old 02-18-2020, 03:58 PM   #3
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Brand: Keystone
Model: Sprinter
State: Florida
Posts: 1,199
THOR #15553
be sure to use Cleaner and ABS glue. Not pvc as the factory probably did.
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Old 02-18-2020, 04:13 PM   #4
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Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 2,463
THOR #13932
A self tapping screw or two or three in every joint after you glue as told above.
I seldom put a plastic joint together without one, if that's all I can reach, or three if possible, self tappers put into the joint.

This does away with any fear of any wedged angle within the pipe joint.

And

They make flexible joints that adapt to any angle discrepancy from the standard 45/90/straight joints.

And

A stretch of silicone pipe under that driveshaft will take a LOT of banging without breaking or tearing. Armor the bottom of the silicone pipe with a half piece of abs pipe gorilla taped to it.

So many fixes available for such things.

When you went to Lowes or such to look at cures, what did you find?

But:

Spend a small amount of money on a macerator and an electric black tank valve and do away with the stupid 3" pipe running across the driveline. Tack the 3/4" garden hose expulsion line where ever you like to the undercarriage without concern for level or downhill.
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Old 02-19-2020, 06:47 PM   #5
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Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 2,463
THOR #13932
I try to present proofs of what I type as a fix. I'm usually experience based and not Google based.
Here's a pic I took today while checking a BIG rain water collection tank.

Three self trappers, no worries.
(the seemingly crud on the pipe is actually a camoflauge paint pattern so it won't be seen easily when looking up at it.)

Other Pictures are of:
Macerator

3/4"(soon to be 1" just because I can) hose

Remote switches for macerator, black tank, gray tank, tank rinse, hose washer outer(tank rinse and hose clean are on one switch, on/off/on, since they'll never be on at the same time) .

Hose rinse and tank rinse are on timers,or will be if the timers arrive this week.

The switches are in this location so I don't have to climb under the damn slider. We don't use the slider very often, and we never hook up to sewer or water except to dump or fill and then only for the time it takes to do the task, so we'd be on our way out of the park and the slide would be in anyway, but I had to put them somewhere and this is a gooder location.

Just do away with that awful system you have. $300 gets you this set up.
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Below is a link to most of my modifications either accomplished or pending.
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Old 02-19-2020, 07:04 PM   #6
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Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 16,769
THOR #8860
One more thing :
Welcome to the Forum, and I hope that you find a solution!
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Old 02-24-2020, 09:43 PM   #7
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Brand: Thor Motor Coach
Model: ACE 29.4
State: Ohio
Posts: 33
THOR #4541
Had a similar problem with gray tank. The fittings came apart. I took it apart, re-glued and it was fine for a few months. The fittings were strained because of the angle and came apart again. After 2 attempts, I figured I needed a better fix. Went to Lowes, bought a rubber pipe sleeve, trimmed the length to fit, slid it over the ends of the pipes, added a couple of hose clamps and 2 years later, still working fine.
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Old 03-05-2020, 04:29 AM   #8
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Brand: Thor Motor Coach
State: California
Posts: 176
THOR #17478
Quote:
Originally Posted by kprun View Post
Had a similar problem with gray tank. The fittings came apart. I took it apart, re-glued and it was fine for a few months. The fittings were strained because of the angle and came apart again. After 2 attempts, I figured I needed a better fix. Went to Lowes, bought a rubber pipe sleeve, trimmed the length to fit, slid it over the ends of the pipes, added a couple of hose clamps and 2 years later, still working fine.

Took the solution right out of my mouth! Had to use them when replacing my knife waste valves on my fifth wheel. Could not get the valves back together without snapping them do to alignment issues. When they snapped, the rubber seals popped out of position. I cut the pipes and installed the sleeves. This gave me the ability to put the drain system together then connect them with the sleeves. Made the job a snap!
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