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06-13-2018, 06:38 AM
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#1
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Seasoned Camper
Join Date: Apr 2017
Location: Little Slice of Heaven..Missouri
Posts: 98
M.O.C. #19731
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Dometic 320 Toilet - Will it Fit All Montanas?
So I am plumbing challenged, so before I take the advice offered here about replacing my Thetford Toilet with a Dometic 320, I wanted to ask this question after reading reviews on Amazon. Sounds like the advice here is to replace your Thetford before you regret it?
1. I have a 2018 3721RL and wanted to find out if this toilet will fit? Our toilet is located against a curved back wall.
2. Can a plumbing impaired guy like me install it? In other words, can, say a 8th grader install it?
Thanks in advance!
__________________
2018 Montana 3721RL
2018 Ford F350 6.7 Turbo Diesel
Life Comes Down to a Simple Choice..Get Busy Living or Get Busy Dying
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06-13-2018, 06:43 AM
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#2
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Montana Master
Join Date: Feb 2012
Location: Lake Gaston
Posts: 8,773
M.O.C. #12156
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Yes. You will need to take some measurements. On our 2010, had to adjust a closet door in the bathroom so it would open and close. Easy install. YouTube videos available.
__________________
Mike and Lorraine
2002 3655 FL, 2005 3650RK
2010 3665RE, 2015 3910FB
F350 crew cab dually 6.7
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06-13-2018, 06:59 AM
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#3
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Montana Master
Join Date: Sep 2014
Location: Full Timer In Naples, Florida
Posts: 1,049
M.O.C. #15731
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I just replaced mine and you need 11" from the center of the floor flange to the wall for the 320. It was easy to do the only issue is i changed the fresh water hook because the placement was different. But easy to do.
__________________
2017, 3500 Ram Big Horn, 4x4, Crew Cab, DRW, Aisin Transmission, 4:10. Curt Q20, 2014 Mountaineer 331 RLT, Sailun's on the rv and truck.
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06-13-2018, 08:41 AM
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#4
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Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 3,198
M.O.C. #13740
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My back wall is curved as well and the only thing I had to do was figure out how I wanted to handle the difference in water inlet as noted above. I made a pex based adapter to handle the issue, but flexible braided hoses exist to do it as well.
__________________
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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06-13-2018, 09:08 AM
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#5
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Montana Master
Join Date: Sep 2017
Location: Tacoma
Posts: 1,567
M.O.C. #20475
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I would change it before you have a problem with. Are's leaked the first time out from the air gap valve on the back of the toilet put in the 320 and never looked back! it's ease to do i'v done it in 3 other SOB's you can watch some of the vid'd on how to do it.
__________________
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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06-13-2018, 09:13 AM
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#6
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Site Team
Join Date: Jun 2011
Location: Wilsey
Posts: 18,799
M.O.C. #11455
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In our 2010 we had to cut a closet door and had to use the smaller bowl one, I believe it's 310 in order to get the door to close. So be sure and measure.
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07-14-2018, 04:34 PM
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#7
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Montana Master
Join Date: Dec 2005
Location: Eugene
Posts: 1,063
M.O.C. #5091
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Just curious, but I have a 3000RK 2010 Montana. Has anyone put the Dometic 320 in their rig. Measured the distance from bolts to wall and I think it was about 10 1/2 inches. Everyone says you need 11 to 12" to fit so it doesn't hit wall I guess. Have had the Thetford since 2010 and no leaks yet, but wonder if I am just lucky and it will cause major problem in near future.
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07-14-2018, 10:23 PM
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#8
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 3,038
M.O.C. #5651
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Search the net for an installation manual for the 320. I did it this spring and the manual has ALL the dimensions you need - width, depth, etc - with pictures/diagrams.
Others have mentioned rotating the flange in the floor a little to gain clearance for doors, etcs.
If you are using PEX piping, be sure to use shark bite connectors. Everyone including me raves about them. SOooo easy to use. I even spent the extra $3 or so for the removal tool!!! Never know when you may want to change things later on.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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07-15-2018, 04:51 PM
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#9
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Montana Fan
Join Date: Sep 2015
Location: Eureka Springs
Posts: 432
M.O.C. #17829
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It went into my 2015 3100rl with no problems.
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11-29-2021, 08:14 PM
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#10
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Seasoned Camper
Join Date: Mar 2021
Location: Mesa
Posts: 72
M.O.C. #28356
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Will the Dometic 320 toilet fit into the 3120RL (2021)? I'd like to go from the 310 to the 320 and I think the difference is only an inch.
Anyone? Bueller?
Thanks in advance
__________________
2021 Keystone Montana 3120RL w/ Onan 5500 & solar
2021 Ford F350 6.7L CC SRW SB w/ B&W Companion Slider, Smart Air II air bags
Home base is Mesa, AZ
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11-29-2021, 09:39 PM
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#11
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 3,038
M.O.C. #5651
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Quote:
Originally Posted by WhatExit?
Will the Dometic 320 toilet fit into the 3120RL (2021)? I'd like to go from the 310 to the 320 and I think the difference is only an inch.
Anyone? Bueller?
Thanks in advance
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See my post above and do the measurements.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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