How to Replace an RV Toilet Seal

Last Updated: August 22, 2019 References

One of the benefits of camping in an RV is the easy access to toilet facilities--no more trudging through cold or wet weather in the dark to use the nearest outhouse. But this convenience also comes with the necessity of regular maintenance and sometimes repair work. A leaky toilet is one of the less pleasant repairs. A leaky seal does not only allow odors to filter back into the RV, it can also allow water to collect and rot the floor of the bathroom. An RV toilet seal replacement is a fairly easy job, capable of being handled by 1 person, but parts of it may be easier with a helper.

Steps

1
Purchase a new RV toilet seal, making sure to get one for your RV make and model.
2
Park the RV on a level surface.

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3
Turn off the water pump and disconnect any lines to outside water sources.
4
Turn off the water supply to the toilet. There is normally a valve at the rear of the toilet that you can turn with a wrench.^{[1]
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5
Flush the toilet to remove as much water as possible from the bowl and dry it out with a rag.
6
Put on rubber gloves to protect your hands from waste debris. You may want to put on a face mask for added protection.
7
Remove the waste water holding tank under the RV following the instructions in your RV owner's manual. While not strictly necessary to remove the holding tank, it will make the job far more pleasant to do and remove the fear of reclaiming a lost tool from the tank.
8
Locate the bolts holding the toilet to the floor and remove them. There are usually only 2 bolts, but some of the larger RV toilets have 3 bolts.^{[2]
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9
Lift the toilet up and set it aside.
10
Remove the old seal. It may be made or rubber or wax. It should lift out easily but if it won't, carefully work on it with a flat-head screwdriver to loosen it so it can be removed and discarded.^{[3]
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11
Scrub out the flange that holds the seal and all of the area around it that you can reach.
12
Place the new RV toilet seal in the flange, using plumber's sealant to help seat. Allow to dry before proceeding.^{[4]
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13
Set the bolts back in their holes, and lower the toilet onto the new seal. Carefully tighten the bolts.
14
Connect the outside water lines and turn on the water pump.
15
Open the water valve to the toilet and flush to check for problems.^{[5]
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Community Q&A

Question

Can I use a wax ring on it?

Community Answer

It depends on the make and model, and most older ones simply mount to the floor with a rubber cup seal.
Question

How do I remove the holding tank?

Community Answer

On older models, remove the table and bench seats on the left hand side. Lift up the door, and you will see the holding tank. Remove any hardware anchoring it to the floor, then disconnect your water lines and pump and remove from the box, if necessary. Always drain completely when possible, as they are awkward to remove with only a gallon left in it.
Question

The water does not stop filling up the bowl when flushed. What should I do?

Community Answer

Sounds like you have a problem with the flush valve. Check the rod that connects the flush lever to the valve.

Warnings

Do not begin this repair away from home unless you have the permission of the landowner. Attempting it on public, government owned land could mean a large fine or worse, especially if the waste water tank should somehow spill its contents.

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