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Old 04-16-2021, 05:51 AM   #1
Campy
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Better quality porcelain toilet, which one?

We have had issues with our porcelain toilet since new not holding water in the bowl. I have to replace the rubber seal at the start of every season to get by one year. Tired of dealing with it and now is the time to make a permanent fix. Looking for ideas on brand and or model. I think the one in there now is a Dometic, will verify that... yes it is a 300 series.
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Old 04-16-2021, 08:23 AM   #2
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I've not had a Dometic 300 but it seems the go to brand/model is the Dometic 310 or 320. The 310 is the round bowl and the 320 is elongated. Another notable difference is that the 310 is "rimless" and the flush ports are located along the upper flat rim of the bowl. The 320 has the rinsing ports underneat the upper "rim" like a regular S&B toilet. I always put in a 310 right off the bat.
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Old 04-16-2021, 09:56 AM   #3
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I just found my owners manual and mine is the 310 model. Back in 2019 I ordered and bulk supply of the rubber bowl seals.
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Old 04-16-2021, 10:04 AM   #4
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Don't know the year of yours but Dometic did have a recall on some toilets.

https://northeast-truckcampers.org/d...toilet-recall/
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Old 04-17-2021, 09:53 AM   #5
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That recall is for the Dometic 300 which is all plastic. OP noted that he has porcelain which means 310 or 320.

I have a 310 and was also had a leaky seal, thus would lose water. First, I got some of the grease specified by Dometic at a big box store. Wasn't 100% but better. Now, before I put it into storage between trips, I add some extra water to the bowl, and then pour in a little liquid RV holding tank valve lubricant. It sinks to the bottom of the bowl, and keeps the seal soft and pliable. Haven't had a problem since starting this routine.
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Old 04-17-2021, 11:44 AM   #6
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Do you move your foot from the pedal so the valve snaps shut or slowly release the pedal. Mine if you didn't let it snap shut it would leak.
Smearing some plumbers grease, found at most hardware stores, around the seal periodically also helps.
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Old 04-19-2021, 06:07 AM   #7
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Quote:
Originally Posted by Hblick48 View Post
That recall is for the Dometic 300 which is all plastic. OP noted that he has porcelain which means 310 or 320.

I have a 310 and was also had a leaky seal, thus would lose water. First, I got some of the grease specified by Dometic at a big box store. Wasn't 100% but better. Now, before I put it into storage between trips, I add some extra water to the bowl, and then pour in a little liquid RV holding tank valve lubricant. It sinks to the bottom of the bowl, and keeps the seal soft and pliable. Haven't had a problem since starting this routine.
Quote:
Originally Posted by travelin texans View Post
Do you move your foot from the pedal so the valve snaps shut or slowly release the pedal. Mine if you didn't let it snap shut it would leak.
Smearing some plumbers grease, found at most hardware stores, around the seal periodically also helps.
Got the plumbers grease under the sink with extra seals. I think I'm just going to replace it, clearly there is an issue as it has leaked the bowl dry ever since new. I think I'm going to try the newer version with the rimmed bowl and hope mine was just made wrong. Cant seem to find another brand that would be "better"??
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Old 04-19-2021, 06:40 AM   #8
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I'm a big guy and found the 310 rather small. We replaced one of our toilets with a 320 this last year and I love it. Probably will replace the other one this year. Let the foot pedal "snap" back and use some lubricant/grease and it should seal.

Good luck.
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Old 04-19-2021, 07:08 AM   #9
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Quote:
Originally Posted by Campy View Post
Got the plumbers grease under the sink with extra seals. I think I'm just going to replace it, clearly there is an issue as it has leaked the bowl dry ever since new. I think I'm going to try the newer version with the rimmed bowl and hope mine was just made wrong. Cant seem to find another brand that would be "better"??
Maybe you've already done this, but I didn't see a comment about it, so:

Have you "reformed the seal" to the toilet using the procedure in the owner's manual? On a few (no idea how many) Dometic toilets, there is a "deformity" in the seal seat/flush ball and the rubber gasket doesn't "conform properly" to the face of the ball. When that happens, there's a slight gap that allows the water to "drain from the bowl"... The procedure is to empty the toilet bowl, close the flush ball and pour HOT water into the toilet, allow the water to cool completely and then use a silicone lubricant to recoat the seal ring.

I've seen a couple of toilets that were "EXTREMELY FRUSTRATING" for the owner who had replaced the seal, reseated it repeatedly, couldn't get the toilet to hold water and were about to toss it in the trash. An hour and a pot of hot water saved the day....

While it may not work for you, if you haven't tried it, might save you a couple hundred bucks.....

As for a better brand toilet, I don't think there's anything on the market that works in an RV better than the Sealand/Dometic brand. IMHO, don't fall for the Thetford "hype".....
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Old 10-13-2021, 10:46 AM   #10
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Angry No help from DOMETIC

Man, I wish I had found this thread before wasting an hour listening to DOMETICS "crappy" elevator music. My issue is with the leaking flush ball seal (310, 2 years old, already replaced once). I have another ordered, but will try some of the suggestions mentioned above. FYI: DOM would not send me a replacement seal for the one I got 4 months ago, said, "Take it to a repair point for warranty consideration," and, they would only reply, "there is no recall."
Thanks for the info!
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Old 10-13-2021, 10:58 AM   #11
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Originally Posted by Readi2Roll View Post
Man, I wish I had found this thread before wasting an hour listening to DOMETICS "crappy" elevator music. My issue is with the leaking flush ball seal (310, 2 years old, already replaced once). I have another ordered, but will try some of the suggestions mentioned above. FYI: DOM would not send me a replacement seal for the one I got 4 months ago, said, "Take it to a repair point for warranty consideration," and, they would only reply, "there is no recall."
Thanks for the info!
The CS rep you spoke with is correct. There is no recall on the Dometic 310 toilet and the rubber bowl seal is considered a "wear item" and not covered by warranty "after use".... Quite often they'll send a replacement seal if the one you get is "defective upon installation"... After a couple of months, it's always been my experience that they won't replace it.
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Old 10-13-2021, 12:35 PM   #12
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If you decide to change to a different Dometic, be sure to spec it out. They are not all plug and play swap out for dimensions.

The newer 310's have a wooden "no slam seat". Works for me! lol

Good Luck,
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Old 10-13-2021, 01:25 PM   #13
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Don't swap it for Thetford thinking it's better! It's by far worse.
At least you can get reasonably priced parts for Dometic toilets.
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Old 10-13-2021, 02:16 PM   #14
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Quote:
Originally Posted by Readi2Roll View Post
Man, I wish I had found this thread before wasting an hour listening to DOMETICS "crappy" elevator music. My issue is with the leaking flush ball seal (310, 2 years old, already replaced once). I have another ordered, but will try some of the suggestions mentioned above. FYI: DOM would not send me a replacement seal for the one I got 4 months ago, said, "Take it to a repair point for warranty consideration," and, they would only reply, "there is no recall."
Thanks for the info!
Rather that replace the seal which gets dried out when not in constant use, put on a rubber glove, take the vaseline out and put a dab on your gloved finger and wipe the edge of the seal. That will bring the seal back to life and it will hold water. I also carry a spare... just in case.
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Old 10-13-2021, 07:20 PM   #15
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Rather that replace the seal which gets dried out when not in constant use, put on a rubber glove, take the vaseline out and put a dab on your gloved finger and wipe the edge of the seal. That will bring the seal back to life and it will hold water. I also carry a spare... just in case.
Better to use "plumbers grease" found at most hardware stores, petroleum products are detrimental to rubber seals & gaskets.
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