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Old 12-14-2015, 05:09 PM   #1
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Replacing old toilet with a new one

I'm going to replace the Dometic model 310 toilet with a new 310 model. Is this going to be an easy swap like it seems it should, or can I count on running into problems?

The trailer is in winter storage and suddenly for some unknown reason it quit holding antifreeze in the bowl. I feel replacing the entire toilet will be quicker and easier than trying to replace the flapper and gaskets on the old one.
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Old 12-14-2015, 07:30 PM   #2
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Just sounds like the seal (rubber gasket) needs replaced. It only takes a couple minutes due to it coming out and going in from the bowl. It just fits into a flange around the top perimeter of the opening. If you are dead set on changing out the whole thing it should take no more than 15 minutes. 2 nuts on the mounting studs (just like at home) and she comes right up. A wax donut is not used, a foam rubber floor seal is used and that comes with it. The new one comes with complete easy to understand instructions.
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Old 12-14-2015, 09:18 PM   #3
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dometic toilet

I agree with bubbles. I would try the gasket first, a lot cheaper and may very well solve your problem. Can't hurt to try it.
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Old 12-14-2015, 10:28 PM   #4
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Quote:
Originally Posted by Oakman View Post
I'm going to replace the Dometic model 310 toilet with a new 310 model. Is this going to be an easy swap like it seems it should, or can I count on running into problems?

The trailer is in winter storage and suddenly for some unknown reason it quit holding antifreeze in the bowl. I feel replacing the entire toilet will be quicker and easier than trying to replace the flapper and gaskets on the old one.
IF your going to replace it go ahead and go up to the Model 320. A full sized man's toilet. You can then go to Lowes and buy any elongated toilet seat, just like at home. I like the seats that don't slam shut, DW likes that also.

Just make sure you get the 18" tall and not 14" unless you like your knees in your chest and take into account that it is elongated and will stick out a little more. I upgraded in our 33IK and it fits just fine.
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Old 12-15-2015, 09:28 AM   #5
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I replaced a Thetford plastic toilet with a 310 last year. It was pretty simple and no modifications were needed to the waterline.


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Old 12-15-2015, 02:38 PM   #6
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I've always replaced the toilet in every used motorhome I ever bought. A $200 toilet doesn't seem much extra expense in a class C. I always replace before repairing when it comes to toilets. Everything else is normally repair before replace.
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Old 12-15-2015, 05:08 PM   #7
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Just be sure to check the dimension from the wall to the center of the outlet. That's what prevented me swapping the toilet in our old RV - not enough space.
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Old 12-16-2015, 01:38 PM   #8
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Quote:
Originally Posted by bubbles View Post
Just sounds like the seal (rubber gasket) needs replaced. It only takes a couple minutes due to it coming out and going in from the bowl. It just fits into a flange around the top perimeter of the opening. If you are dead set on changing out the whole thing it should take no more than 15 minutes. 2 nuts on the mounting studs (just like at home) and she comes right up. A wax donut is not used, a foam rubber floor seal is used and that comes with it. The new one comes with complete easy to understand instructions.
Well even though I don't like the thought of doing it, I've decided to replace the flush seal this spring. I will be wearing gloves but even so, I don't like the thought of putting my hand in that area of the toilet. Perhaps it's because I know what I put through that opening in the mornings.
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Old 12-17-2015, 09:15 PM   #9
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Besure to check the fitting configurations...ie 90 deg elbow etc.
I replace an older model with a new nice and larger seating china bowel, but it took a lot of research and work to get the new one fitted apprx 1.5 inches off the wall and with elbow vs straight tied in !
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Old 12-17-2015, 09:37 PM   #10
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How to replace gasket..

https://youtu.be/vi3TRivsNlQ
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