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Old 06-13-2018, 06:38 AM   #1
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M.O.C. #19731
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
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Old 06-13-2018, 06:43 AM   #2
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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.
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Old 06-13-2018, 06:59 AM   #3
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M.O.C. #15731
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.
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Old 06-13-2018, 08:41 AM   #4
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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.
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Old 06-13-2018, 09:08 AM   #5
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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.
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Old 06-13-2018, 09:13 AM   #6
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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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