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02-20-2022, 01:51 PM
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#1
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,328
M.O.C. #3699
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Looking for some specific model 3442RL info
Has anyone with a 2015 3440RL replace the original Thetford with something else? If you did what model and manufacturer did you use. Our original is a Thetford model 42062 style II high. It isn't that old and is having trouble holding water.
Thanks for any info.
__________________
Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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02-20-2022, 03:07 PM
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#2
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Montana Master
Join Date: Jan 2018
Location: Austin
Posts: 2,411
M.O.C. #21044
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Lots of folks here have installed Dometic toilets (I did but I can’t remember the model numbers). Try searching Dometic toilets…you will find many threads.
__________________
MikenDebbie Aggie ‘77 in the sticks near Austin TX
2019 Chevy 3500 High Country DRW
2018 Montana 3921FB
Aussie Gus + Texas Heeler Jimmy
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02-20-2022, 04:57 PM
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#3
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,690
M.O.C. #12947
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You will have no trouble installing a Dometic 310 or even a 320 toilet. You might need to modify the water line to connect to the toilet if it won't bend to connect, but a couple of sharkbite connectors will work.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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02-20-2022, 08:44 PM
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#4
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,945
M.O.C. #5651
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Dometic website has good info. It has a page with the actual dimensions of the toilet and even a picture I think. You can then measure the area in the bathroom to see if it will fit.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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02-23-2022, 11:57 AM
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#5
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Montana Master
Join Date: Nov 2015
Location: Arlington
Posts: 1,522
M.O.C. #18081
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Swapped out the Thetford on our 2015 3440RL to a Dometic 320 without issue. Also took the opportunity to install an additional water shutoff where the pex comes through the floor just in case.
__________________
SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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03-02-2022, 02:08 PM
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#6
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Established Member
Join Date: Mar 2021
Location: Allen
Posts: 31
M.O.C. #28272
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We have a 2017 3811MS and have had many issues with the Thetford Aqua Style II toilet. The best replacement I could find is either the Dometic 310 (round bowl) or 320 (elongated bowl). Those have their complaints too though.
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03-02-2022, 02:35 PM
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#7
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Montana Fan
Join Date: Dec 2020
Location: Full Timer
Posts: 117
M.O.C. #27665
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Seems like a lot of toilet questions today…check out the other threads.
__________________
Full-Timing since 2018 in a 2013 3625RE, 2023 Ford F450DRW with High Output Diesel,
Custom kingpin-mounted hitch receiver for bike rack 2019
MorRyde I/S with 8K Axles & Goodyear G114 Tires on 17.5” aluminum wheels 2020
FlexArmor roof 2021, Starlink
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03-03-2022, 02:36 PM
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#8
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,328
M.O.C. #3699
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Quote:
Originally Posted by VagabondLove
Seems like a lot of toilet questions today…check out the other threads.
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Thanks for your concern.
__________________
Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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03-03-2022, 02:38 PM
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#9
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Montana Master
Join Date: May 2005
Location: Fall Creek
Posts: 1,328
M.O.C. #3699
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The Dometic 320 fit perfectly into our 3442RL. Right off the bat what I love about the Dometic, which I didn't know is that you can change the ball gasket without removing or disassembling the toilet. That gasket is usually the problem with the Thedfords.
__________________
Bob and Nancy Kassl Fall Creek, Wisconsin
2015 Montana 3440RL Legacy Edition, G614's, Pressure Pro TPMS, Dish Tailgaters
2016 GMC Sierra Denali 3500 CC SRW, Iridium Metallic, Duramax Allison Transmission
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03-03-2022, 03:09 PM
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#10
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Montana Master
Join Date: Nov 2015
Location: Arlington
Posts: 1,522
M.O.C. #18081
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Hi Bob, we had just as many issues with peddle valve and the anti-suction valve. One of our best days was the day we removed that toilet.
__________________
SOB
2015 Volvo VNL780 D13, iShift, 32k ET air hitch, Idle Free LiFePO4 APU
16.8KWhr LiFePO4, 2.52 kw solar, 10kva Victron split phase
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03-05-2022, 10:11 AM
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#11
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Montana Master
Join Date: Jan 2018
Location: Northville, NY
Posts: 807
M.O.C. #21158
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One of my smartest and might I add easiest mods was replacing our Thetford toilet with a Dometic 320. As was stated above you may need to modify the supply line to accommodate the connection. I simply cut off the old connection and added this shutoff valve. It made the whole job simpler and gave me the ability to shut off the toilet without shutting off all our water.
https://www.lowes.com/pd/SharkBite-U...ine/1000182489
Total job time was about half an hour.
Added bonus. When I shopped dealers in my area only one had the color (bone) I wanted and when I got there, it was on sale for 50% off.
Some days it all just comes together. 
__________________
Jim B
2017 Lariat F-350 FX4, CC, SB, 6.7 PSD 4WD
2018 MONTY 3731FL, at our private winter site in GA
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