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Old 08-28-2018, 05:44 AM   #1
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Dometic toilets

What is the difference between the 320 & 310 Dometic toilets, other than the size? I have a 17' 3790RD & it looks like the 320 might be a tight fit. Anyone replace the toilet in that model?
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Old 08-28-2018, 06:26 AM   #2
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We have a 320 with sprayer and fit is no problem. We prefer it over the 310 because it has an elongated bowl with a rim. The 310 has no rim. Our Montana is the 3791RD.
2018.5 Montana 3791RD
2012 F350 SRW 6.7 PSD

Full Timing since September 1, 2010
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Old 08-28-2018, 09:17 AM   #3
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3402 big sky and the 310 fit no problem.
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Old 08-28-2018, 10:23 AM   #4
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As far as door clearance they are the same. The 320 sticks out a bit further into the bathroom, but it is hardly noticeable
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Old 08-28-2018, 10:34 AM   #5
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The other difference is the water outlets into the bowl. 320 pretty much directly vertical flow, 310 does a slightly sideways flow of water to rinse bowl. At least that is the way they were a couple of years ago.
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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Old 08-28-2018, 10:34 AM   #6
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3402rl and 320 fit no problem.
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Old 08-28-2018, 06:09 PM   #7
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Our 310 does have the flow going sideways, so the water is flowing in a counter-clockwise rotation. I wonder if they make a different 310 for sale in the southern hemisphere where the water drains in a clockwise rotation?
Bob & Becky
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