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Old 05-30-2017, 07:27 PM   #1
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Replacing Toilet Flange Gasket

I recently purchased a 2004 Holiday Rambler 30' Admiral motorhome. On our first outing we noticed a sewer smell in the bathroom. Knowing the PO had recently replaced the toilet I suspected the flange gasket could be suspect. I checked everything else I could think of hoping I would not have to remove the toilet. It finally got down to where I needed to remove the toilet and check the gasket area. Sure enough, the flange gasket was on up side down and distorted into kind of an egg shape.

When I reinstall the new flange gasket would there be any problem with spraying the tank side of the gasket with silicone spray so it will slide easily into proper position? I sprayed the old gasket a couple days ago and noticed no ill effects but that has been a very short time. The can says the silicone can be sprayed on rubber but I'm not sure exactly what type of material the gasket is made of.

Thanks for any help you can provide,
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Old 05-30-2017, 08:29 PM   #2
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Spray silicone isn't going to hurt it, I'd get some silicone plumber's grease to do a better job of sealing the gasket.

Often black tank odors get into the bathroom due to the toilet valve not being totally closed. I always fill the bowl with a half inch of water after flushing. If the water drains out, I know the valve isn't sealing properly. Another issue is traveling with windows or roof vents open. The low pressure crated in the RV will draw odors in from the black tank.

Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 05-31-2017, 05:38 AM   #3
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I also use silicone plumber's grease.
2000 HR Endeavor 40PBD, Freightliner XC, CAT 3126B
Gut/Remodel Thread
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gas, toilet

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