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Old 09-15-2020, 04:43 PM   #1
Lars
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Dometic toilet upgrade

Good evening. I have a leaking Dometic 300 toilet in my 2018 Springdale SS 2020QB. My question is: Do I have enough clearance from the wall to the flange to repalce it with a Domeic 310? Thank you for all you help.
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Old 09-15-2020, 05:24 PM   #2
chuckster57
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I donít see a reason it wonít fit. Check how high (profile) you need.
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Old 09-15-2020, 05:39 PM   #3
sourdough
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I would think it would work but you might just pull up the install instructions to be sure. The rough in for the 300 is 8.5" and the 310 is 10". That may or may not make a difference depending on the design of one toilet vs the other.
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Old 09-15-2020, 05:57 PM   #4
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Always surprised at the timing of other people's posts in this forum. We are looking at making the same upgrade for the same reason. I believe there was a "silent" recall (good will replacement) on Dometic 300 for leaking seals improperly installed at the factory where they sent out 310s as replacements so I'm assuming that they will fit. Ours is out of warranty and didn't show any signs until about a month ago.
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Old 09-15-2020, 08:52 PM   #5
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Quote:
Originally Posted by Lars View Post
Good evening. I have a leaking Dometic 300 toilet in my 2018 Springdale SS 2020QB. My question is: Do I have enough clearance from the wall to the flange to repalce it with a Domeic 310? Thank you for all you help.
Have you considered a 320 with elongated bowl?
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Old 09-16-2020, 03:50 AM   #6
NH_Bulldog
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Originally Posted by rjrelander View Post
Always surprised at the timing of other people's posts in this forum. We are looking at making the same upgrade for the same reason. I believe there was a "silent" recall (good will replacement) on Dometic 300 for leaking seals improperly installed at the factory where they sent out 310s as replacements so I'm assuming that they will fit. Ours is out of warranty and didn't show any signs until about a month ago.
We are in the process of dealing with Dometic on our 300 toilet for the seal issue. Dealer has all the info and we are waiting for a response from Dometic at the moment. I called Dometic first since our trailer is 15 months old, and they wouldn’t deal directly with me, so we will see what the dealer can do. The difference between the 300 and the 310 is that the 300 is plastic and the 310 is porcelain. In the past, Dometic would replace the 300 with the same model or upgrade you to the 310 for $50. Size-wise I don’t think there is an appreciable difference.
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Old 09-16-2020, 06:33 AM   #7
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Originally Posted by rhagfo View Post
Have you considered a 320 with elongated bowl?

Get the elongated bowl and the higher toilet.... 320 is vastly superior and is also porcelin lower part.
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Old 09-16-2020, 05:45 PM   #8
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Originally Posted by sourdough View Post
I would think it would work but you might just pull up the install instructions to be sure. The rough in for the 300 is 8.5" and the 310 is 10". That may or may not make a difference depending on the design of one toilet vs the other.
We've been looking at replacing a 310 with a 320 just due to the size. However, the roughout length for the 320 is 11". Anyone replacing a 300 with a 320 will need to be sure there is at least 2.5" of free space behind their current toilet in order to set the new toilet onto the gravity drain. If there isn't, then modification (moving) the floor drain system might be required. I'm not saying it can't be done - just make sure the dimensions of the replacement will fit the space available. Here's a link with some illustrations and associated dimensions:

Dometic_310_series_manual.pdf

I've never done this, but after our next trip I want to try. HTH
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Old 09-16-2020, 07:17 PM   #9
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Originally Posted by NH_Bulldog View Post
We are in the process of dealing with Dometic on our 300 toilet for the seal issue. Dealer has all the info and we are waiting for a response from Dometic at the moment. I called Dometic first since our trailer is 15 months old, and they wouldnít deal directly with me, so we will see what the dealer can do. The difference between the 300 and the 310 is that the 300 is plastic and the 310 is porcelain. In the past, Dometic would replace the 300 with the same model or upgrade you to the 310 for $50. Size-wise I donít think there is an appreciable difference.
We are also in the process. Was told to contact the dealer. However, ours is getting the floor replaced as I type. 6 more weeks. Hopefully they will change out the toilet so there are no more issues with water. Now to work on the batwing antenna.
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Old 09-17-2020, 03:16 AM   #10
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I change out the Thetford Aquamagic abomination first mod to my current trailer with a 320 as it is both taller and the seat shape accommodates human beings. The Aquamagic did not. Had sufficient room behind and installed a water cut off valve in the supply line (don't know why but it makes me feel good). Seems I used or had to use different bolts. Can't recall why. I also bought one of those little Dometic plastic valves that sometimes fail to ensure no camping trip was spoiled by not having it. I had one fail on a 310 I had in a Sunnybrook and it dribbled water. Never used it but if needed have it.
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Old 09-17-2020, 04:33 AM   #11
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Originally Posted by wiredgeorge View Post
I change out the Thetford Aquamagic abomination first mod to my current trailer with a 320 as it is both taller and the seat shape accommodates human beings. The Aquamagic did not. Had sufficient room behind and installed a water cut off valve in the supply line (don't know why but it makes me feel good). Seems I used or had to use different bolts. Can't recall why. I also bought one of those little Dometic plastic valves that sometimes fail to ensure no camping trip was spoiled by not having it. I had one fail on a 310 I had in a Sunnybrook and it dribbled water. Never used it but if needed have it.
I did the same thing in my old Passport...
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