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Old 12-01-2015, 06:03 PM   #1
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2012 27' FB International
Boulder , Colorado
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Posts: 66
Toilet bowl very slowly leaking

No visible cracks in the stopper (like last time), have used pure silicone when winterizing so rubber seal isn't dried out. Any ideas what to look for? Last time Dometic just replaced it due to crack, so toilets a year old.

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Old 12-01-2015, 06:29 PM   #2
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Does it have a ball that rolls into the seal?

I had that on my old trailer and always had one issue or another.

Once the band clamp was loose, it is like a big hose clamp at the base of the toilet.

Then twice there wast junk stuck around the seal where it met the ball.

Last time they replaced the valve with the ball.

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Old 12-01-2015, 06:31 PM   #3
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The Dometic in my unit leaked a bit as well and I could not see any problem with a visual inspection of the bottom seal so I took the toilet off to have a look. Flange gasket appeared ok and the water intake valve did not appear to be leaking. Mine was assembled with a joint running horizontally about half way up the bowl and the whole contraption was a bit loose. The halves can be retightened with a screw driver. Access from the underside. Once retightened, all was good. Jim

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Old 12-01-2015, 07:41 PM   #4
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Boulder , Colorado
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Yes, it has the rotating spherical stopper. I cleaned and inspected the rubber seal and it appears fine.
The bowl is one piece with no visible screws to tighten.
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Old 12-02-2015, 11:34 AM   #5
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Sounds like the seal's dried out. It's a routine maintenance sort of thing.

Did you grease the seal after you cleaned it??....with plumber's grease??

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Old 12-02-2015, 11:59 AM   #6
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Always helps to let it spring closed -- if you let your foot up gently on the pedal, it doesn't drive the edge of the ball as far into the gasket. Works on mine, anyway.

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Old 12-02-2015, 12:54 PM   #7
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2007 25' Classic
Hutto , Texas
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Mine occasionally lets the water seep out. Usually after we haven't used it for a few weeks and it's dried out. Put a tablespoon of olive oil in the dry toilet bowl and let it stand for a day. The oil will lube the seal and will help. I've fixed ours several times by doing this.
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Old 12-02-2015, 01:33 PM   #8
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Hard to believe the seal is dried out in one year, especially given you've used silicone, cleaned it and checked for defects. But, it happens. I had the same symptoms without indicators. Followed the toilet OM troubleshooting guide, which said, as the 2nd to last resort, remove/replace the rubber seal. The last resort was to replace the toilet. But, you've already done that. I ordered the seal online, as my local rv guy had some, but not for Dometic brand, and couldn't/wouldn't guarantee a correct fit. Replaced the sealwhen it came in the mail and it hasn't leaked a drop since...or should I say "yet"?
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Old 12-02-2015, 07:09 PM   #9
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1966 24' Tradewind
Conifer , Colorado
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I find RV antifreeze works pretty well on rubber seals. I had a new dump valve seal get sticky when I pulled the valve open. I sprayed RV antifreeze in there and it started working smoothly again. I keep an inch of RV antifreeze in my toilet bowl all winter.

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Old 12-02-2015, 07:32 PM   #10
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I smear silicon grease around the seal every few months.

Make sure there isn't something small stuck in there breaking the seal.
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Old 12-02-2015, 10:07 PM   #11
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2012 27' FB International
Boulder , Colorado
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Thanks for all the replies guys. I put on some nitrile gloves, folded a paper towel, and thoroughly cleaned the entire gasket and the spherical stopper, then I cleaned the sealing edge with the stopper far so good. I'm not convinced yet, but we'll see in a few days. When faced with a problem, it helps to know you are not alone...this forum is awesome!

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