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04-06-2019, 08:35 AM
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#1
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Seasoned Camper
Join Date: Mar 2016
Location: Flushing
Posts: 72
M.O.C. #18353
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Toilet leak
I have a 2019 Montana 3791RD and have a water leak from high up at the rear. I believe the unit high up is probably a backflow protector. I had no manual and I can’t find any manufacturers number on the unit.
I intend to buy a replacement unit from where the leak is coming from, but require the manufacturer of the toilet and the model. So from a manual that you may have been lucky to receive, can you identify the toilet for me.
It is probably Thetford, and I am aware that many have replaced Thetford with Dometic. I may get a Dometic if I don’t fix the leak, is the Dometic a straight drop in. (Will the water line require lengthening or shortening, are the base fastening bolts in the same position)
Thanks
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2018 GMC Denali 3500 Duramax Dually
2019 Montana 3791RD
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04-06-2019, 09:15 AM
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#2
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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04-06-2019, 11:53 AM
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#3
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Montana Master
Join Date: May 2017
Location: South East NC
Posts: 1,768
M.O.C. #19865
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Yes, Dometic is a straight drop in. Get the 320 now,,, or get it later after more problems!
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John & Patty
2022 3855 BR
2019 Lariat F350 4X4 Dually
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04-06-2019, 12:34 PM
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#4
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Montana Master
Join Date: Nov 2015
Location: Arlington
Posts: 1,522
M.O.C. #18081
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Quote:
Originally Posted by CaptnJohn
Yes, Dometic is a straight drop in. Get the 320 now,,, or get it later after more problems!
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Agree 100%!
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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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04-06-2019, 09:14 PM
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#5
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,697
M.O.C. #12947
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The only thing that isn't exactly the same is, the water line connection at the back of the Dometic toilet is on the opposite side from the Thetford. I was lucky when I replaced ours that I was able to just swing the end of the PEX over, but some will need to cut an elbow into the line so it will reach.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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04-06-2019, 10:29 PM
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#6
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Montana Master
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
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Had to do the same thing that jeffba did! still very ease to do.
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Bob & Carol Washington St
2017 HC HM352RL 2018 Dodge 3500 laramie CC LB 4x4
Curt Q25 with puck system, Factory air bags
Happy Trails
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04-06-2019, 11:17 PM
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#7
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,952
M.O.C. #5651
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I got a metal flexible hose extension like on a toilet at home. Then added a shut off valve and an adapter for a pex line. Pretty easy to do. Look for more detailed instructions on here somewhere.
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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04-07-2019, 04:24 AM
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#8
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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Oh and when you get the shutoff valve, buy the contractor pack. Then after you install your new Dometic, spin around and add shutof valves under the sink. Tehn if you have time add shutoff valves to the washer lines. and if you still have time add shut off valves under your kitchen sink.
At this point if you still have a shutoff valve do not go near DW with it. They don't have a sense of humor about that and it will not go well
__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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04-07-2019, 10:09 AM
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#9
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,952
M.O.C. #5651
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Where is the 'like' button for jeffba!!! ha ha
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Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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04-08-2019, 04:55 PM
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#10
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Montana Master
Join Date: Jun 2017
Location: Northern Illinois
Posts: 525
M.O.C. #19994
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I installed the Dometic 320 a year ago, it just started leaking past the seal, wont hold water, I tried vaseline, still leaks, any recommendations
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The "Black Pearl"-2017 3731FL Legacy Package
2017 F-450 Platinum, 6.7 PSD
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04-08-2019, 07:49 PM
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#11
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,697
M.O.C. #12947
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You might try cleaning the underside of the seal. We use a round toilet brush, and can scrub the seal underside with the brush. Our 310 is about six years old, and still seals like it did new. Otherwise, there is a two year warranty on the Dometic toilet, and at the very least, they should be able to send you a new seal kit.
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Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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04-09-2019, 08:24 AM
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#12
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Montana Fan
Join Date: Jun 2013
Location: Boise
Posts: 288
M.O.C. #13564
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Just pull the seal out and wipe it clean and reinstall. You can do this without the removal of the toilet. Just grab hold of the seal and pull it out. This is very easy to do and the reinstall is just as easy.
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04-09-2019, 11:11 AM
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#13
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Montana Master
Join Date: Jun 2017
Location: Northern Illinois
Posts: 525
M.O.C. #19994
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I did try cleaning and greasing it, I did not try to remove it. But thanks, now I will pull it out and reinstall
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The "Black Pearl"-2017 3731FL Legacy Package
2017 F-450 Platinum, 6.7 PSD
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04-09-2019, 11:48 AM
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#14
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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Just do not drop it
__________________
Mocha, one-eyed toothless, hurricane survivor, Pirate dog
2019 20th Anniversary Edition 3701LK
B&W 20K for Ford OEM Puck
2018 Ford F-350 Lariat CCLB PSD DRW KJ5CQH
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04-09-2019, 02:47 PM
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#15
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,364
M.O.C. #4831
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Both the Dometic 310 and 320 have a seal which needs periodic cleaning to keep it from leaking. Once a year or so clean it to remove any "junk" on the bottom side. It pops out very easily and reinstall is also easy but you do have to take care to get it positioned in the groove properly.
Note the valve is only open long enough to grasp the seal and pull it out. Replace it with the ball closed to avoid dropping it somewhere bad.
A picture is worth a thousand words.
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Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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04-15-2019, 09:38 AM
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#16
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Montana Master
Join Date: Jan 2018
Location: Northville, NY
Posts: 807
M.O.C. #21158
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Carl,
Nice video but I did get a bit sea sick as he bobbed his head and cam while talking.
One question, is the ball and seal set up the same in the Thetford? I've had no issues with ours but will likely switch it out at the first sign of trouble.
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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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