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07-22-2020, 06:06 PM
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#1
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Seasoned Camper
Join Date: Oct 2017
Location: Tallahassee
Posts: 67
M.O.C. #20649
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3820FK Toilet Replacement
We are in a 2017 3820FK, the toilet bowl is not holding water anymore without letting the foot pedal snap back. Rather than swapping the seal, want to upgrade to the Dometic 320. Currently have the Thetford. Wondering if any3820FK owners have swapped their Thetford out for the Dometic? Looks like a no brainer just curious if the water supply line will connect without any mods? Thanks Joe
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07-22-2020, 06:11 PM
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#2
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Montana Master
Join Date: Mar 2020
Location: Lamesa
Posts: 621
M.O.C. #26010
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I don't have your trailer but I have replaced 3 Thetford toilets in 3 Keystone trailers and not had a problem. Look at how yours is connected now and the Dometic connection point. They have always been a bit off due to the difference in designs but not enough to be any more than "pull it off the floor and slap the new one in". I will note on this one (new) once connected the Dometic caused the supply line to bend a little and put more pressure on the toilet fitting than I wanted so just removed a little from the entry hole and all was good. A good eyeball on the situation should tell you what you need. I have read of some that replaced fittings etc. on the replacement but do not know why they did it.
__________________
Danny and Susan wife of 55 years
2019 Ram Laramie 3500 6.4 4x4 CC 4.10 SRW
2020 Montana High Country 331RL
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07-22-2020, 06:37 PM
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#3
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Montana Master
Join Date: Oct 2017
Location: Bastrop
Posts: 2,892
M.O.C. #20753
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you might have to tweak the water line. Add a shutoff valve while you are in there
__________________
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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07-22-2020, 06:42 PM
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#4
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,716
M.O.C. #24086
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Monty published this
Changing toilet (with pictures)
https://www.facebook.com/groups/2740...4851357238603/
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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07-22-2020, 08:17 PM
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#5
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,400
M.O.C. #4831
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Quote:
Originally Posted by Daryles
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Oops, link doesn't work (and I am a member of the Group).
__________________
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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07-22-2020, 10:14 PM
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#7
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 7,400
M.O.C. #4831
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Quote:
Originally Posted by Daryles
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Nope, it says:
The page you requested cannot be displayed right now. It may be temporarily unavailable, the link you clicked on may be broken or expired, or you may not have permission to view this page.
__________________
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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07-22-2020, 11:03 PM
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#8
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Montana Master
Join Date: May 2019
Location: Alton
Posts: 2,716
M.O.C. #24086
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Weird that it works for me.
OK. Go to Keystone Montana RV Owners Group, in Facebook.
Search for Monty W. Parks, Dometic 310 toilets.
__________________
Daryl and Marianne,
2019 3130re 20th Anniversary Edition
2016 F350 Lariat
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07-23-2020, 06:25 AM
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#9
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Montana Fan
Join Date: Sep 2016
Location: West Melbourne
Posts: 310
M.O.C. #18980
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Works for me too. I have also upgraded to the dometic 320.
__________________
Butch and Kathy
2016 3160RL Legacy, Sailun S637, Centramatic Balancers, 2-T105s, Amish Refrigeration, ARPrv, SoftStartRV, FlexArmor roof
2016 F350 6.7L SRW
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07-23-2020, 06:34 AM
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#10
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Seasoned Camper
Join Date: Oct 2017
Location: Tallahassee
Posts: 67
M.O.C. #20649
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Thank you all for the feedback. Wish I could have opened the links but.... I must be one of the last people on the planet who doesn't do FaceGram or Instabook. Thanks Joe
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07-23-2020, 07:13 AM
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#11
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,962
M.O.C. #5651
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I replaced mine. I got a toilet hose that is flexible silver to do the connection. Also got a shutoff valve that connects to this hose. And I used shark bite connections to add on a standard threaded connector to attach the hose to.
Shark bites are great! I had never used it before.
After purchasing this stuff, it took maybe 10 minutes to install.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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07-29-2020, 01:47 PM
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#12
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Montana Fan
Join Date: Mar 2016
Location: Austin
Posts: 226
M.O.C. #18363
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Quote:
Originally Posted by FloridaFlockers
Thank you all for the feedback. Wish I could have opened the links but.... I must be one of the last people on the planet who doesn't do FaceGram or Instabook. Thanks Joe
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Newp. Yer not.
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07-29-2020, 03:01 PM
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#13
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Seasoned Camper
Join Date: Jun 2014
Location: Riverside
Posts: 64
M.O.C. #14426
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Swap the toilet!
I changed my Thetford for the Dometic...only I waited to long.
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07-29-2020, 04:34 PM
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#14
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Seasoned Camper
Join Date: Aug 2019
Location: Elkins
Posts: 56
M.O.C. #24660
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Dometic 320
Florida flockers this is what I used, for my "14 5er the water connection was on the opposite side, with only a short piece of pex coming through the floor, this slips right on, has stainless flex hose and shut off, also need adapter to join hose to toilet, real easy, just hope the pic loads, had trouble last time, lol, got it all at home depot
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07-30-2020, 08:20 AM
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#15
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Established Member
Join Date: Sep 2014
Location: Wenatchee
Posts: 38
M.O.C. #14662
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Quote:
Originally Posted by FloridaFlockers
We are in a 2017 3820FK, the toilet bowl is not holding water anymore without letting the foot pedal snap back. Rather than swapping the seal, want to upgrade to the Dometic 320. Currently have the Thetford. Wondering if any3820FK owners have swapped their Thetford out for the Dometic? Looks like a no brainer just curious if the water supply line will connect without any mods? Thanks Joe
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Didn’t replace but did have a similar problem. Used WD 40 on the linkage and problem went away. There was too much friction to let ball come back. Found out didn’t need to remove toilet after I diagnosed the problem after taking it out.
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07-30-2020, 07:20 PM
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#16
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Established Member
Join Date: Apr 2020
Location: Wallkill
Posts: 13
M.O.C. #26157
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Just went through same issue of not holding water. Using a glove cleaned rubber gasket, then applied a thin coating of vaseline. Holding water for several days now.
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07-30-2020, 07:50 PM
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#17
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,712
M.O.C. #12947
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Holding water with these Thetford toilets is a minor issue. Wait for the time, usually dark 0:30, when the pedal blows of the toilet and water is running, filling the bowl, and you aren't even close to awake enough to figure out what to do to stop the toilet from flooding the rig. I was able to manually turn the shaft to stop the water from flowing, but getting the pedal back on with the spring wasn't happening. I eventually found a new pedal, but less than four months later ended up replacing the toilet with a Dometic, and that's been over seven years ago, and haven't even had to replace the gasket, and we full time.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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07-31-2020, 07:08 AM
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#18
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Montana Master
Join Date: Feb 2020
Location: USA
Posts: 610
M.O.C. #25842
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We full timed for two years in a class C with a preference to off grid camping so we went with a Natures Head composting toilet. When we sold the rig we put the original back in and moved the toilet to our 3121rl. Not for everybody maybe worth considering.
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07-31-2020, 07:46 AM
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#19
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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Buy a pex cutter and some shark bites, it's cheap and they will come in handy for other things like when the backflow preventer fails.
__________________
Dick, Joyce, Diego, Picatso and Gustav
2017 3720 RL, and 2013 HC 343RL
Pullrite Hitch, IS, Disk Brakes, 3rd AC, Winegard Traveler, Bathroom door mod, Dometic 320, couch for desk swap, replaced chairs, sun screens, added awnings, etc.
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08-15-2020, 04:28 PM
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#20
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Montana Master
Join Date: Mar 2015
Location: Gardnerville
Posts: 1,257
M.O.C. #17163
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Yes, our thetford never held water. Lubricated the seal, replaced the seal.. finally installed a dometic 320 and the problem solved.
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