toilet seal replacement

I have done this twice - there are several youtubes on this subject which will help. Removing the toilet was the only hard part - tight space and I had no direct line of sight for to the nut that holds the toilet to the floor (had to use a mirror). I found that using an extension, universal joint, and extended socket made things much easier.

If you decide to buy a new toilet make sure you have enough space - a new toilet would have been about an inch too large to fit in my older bathroom.

I did mine like the Dutchman.

They ain't all the same.

Why buy and install a new toilet if you can just flip a seal in and give that a try?

Mine is a two piece toilet. Remove a metal band around the middle and the top half comes off exposing the rubber seal around the ball. Pretty easy for that type toilet. Stopped holding water several years ago and after replacing the seal it held water until this year. Not having time to replace the seal right way I got some plumbers silicon grease and rubbed it all over the ball. Holding water fine again so I may or may not replace the seal again. The grease is an easy try.

check out this Video by RV with Tito.

https://www.youtube.com/watch?v=EY9-OXVhomc

Two nuts to remove the entire toilet. For mine four screws to remove the bowl from the base. Remove old seal and slip a new one on. Four screws back in and reset on the ring and replace the two nuts.

I had to replace the valve on my Dometic 300 yesterday and did the seal at the same time. Ordered the parts from Amazon. Now that I know how to take it apart I think I could do it again in 30 minutes, top.

I just replaced mine yesterday... believe it or not! It was VERY simple.

It just pulls out. Clean the area where the seal seats. Close the valve in the bottom of the toilet. Simply lay the seal on top of the closed valve and push the edges under the toilet flange and the top of the slider valve. It will fit right on, no tools, takes about 15 seconds. You'll want to push around a little to make sure its set right, so slide the foot peddle slow and make sure it's seated ok. Really, it's REALLY just that simple.

By the way, I bought a new one at my RV dealership. It cost $45! I was shocked. Sounds like Dometic has a monopoly on this seal. But, do it yourself will save you in labor fees. And yes, it really is JUST this simple!

Watch this 4 minute YouTube video. It's how I figured it out. Yes, it talks all of 15 seconds to do this:

Click here.

On our Thetford Style Plus ceramic bowl toilet, changing the seal takes about 15-20 minutes with no need to remove the entire toilet. As said though, other makes/models can take significantly longer depending on the construction.

Our last RV toilet came with one of those disposable finger nail files and instructions to use it on the underside of that seal if it leaks.
I never used it but I did use toilet bowl cleaner and make a special effort to clean under there with a brush.

jplante4 wrote:
Please take some advise. Replace the entire toilet.

Each season my own dealer brings in several dozen Dometic 310 toilets to sell in the parts store. Almost all end up being sold to customers who initially go in looking for replacement parts but who after thinking about it realize that replacing the entire toilet is in most cases the better option even though it may initially cost more. After all, an old toilet even if it can be fixed is still an old toilet with no guarantees something else won't fail. :R

jplante4 wrote:
Please take some advise. Replace the entire toilet. Here's my story.

When we started out on the winter retirement trip, I started fixing the toilet. First it was the pump, then the seal (and the floor gasket), then the seat. At the end of the trip, the only part of the toilet I hadn't fixed was the actual bowl, We didn't tow a car, so every trip to an RV parts store required renting a car. In the end, I paid for a nice china bowl toilet 2 times over.

Good advice. Sometimes it's more practical to replace rather than repair.