Dometric macerator toilet seal replacement

[Bmb240]

I need to replace the seal on my 8700 series dometric toliet. I've checked for some you tube videos but haven't found any. Any tips on this process.2019 open road 36ua.

Thanks

[Old-Biscuit]

Dometic 8700 series doesn't have a bowl seal

Bottom of bowl is inlet to macerator pump which discharges up thru a looped pipe and out to waste tank

Here is exploded parts view

https://www.environmentalmarine.com/...h-panel-parts/


Here is Owners Manual

https://www.dometic.com/externalasse...ilet_62762.pdf

[ernieh]

Why do you think that you need to replace a seal? What's leaking?

[Bmb240]

When you add water to the bowl it drains out almost immediately. No leak but it won't hold any water.

Thanks

[phil-t]

We have the 8700 series toilet in the rear of our 2014 36LA. I don't see how the water could run out without a leak. No bowl seal on this system.

[Bmb240]

OK since I am new to rv ing Shouldn't the the bowl hold water until you flush. Nothing leaking externally but the water drains out almost instantly. If there is no seal on this system what would cause the drainage.

Thanks

[Old-Biscuit]

Originally Posted by Bmb240

OK since I am new to rv ing Shouldn't the the bowl hold water until you flush. Nothing leaking externally but the water drains out almost instantly. If there is no seal on this system what would cause the drainage.

Thanks

The discharge pipe too low
Top of loop must be above water level in bowl otherwise it will siphon out

Anti-Siphon Valve (vacuum breaker) stuck closed
Comes off top loop of discharge pipe

See

[Brianb131]

2019 Phaeton, same problem. Water drains out of bowl within a minute or two.

How do we fix the problem?

[bradvoorhees]

Originally Posted by Brianb131

2019 Phaeton, same problem. Water drains out of bowl within a minute or two.

How do we fix the problem?

See old biscuits post. I’ve had mine torn apart to replace the macerator because I thought it was the reason I wasn’t getting a good flush.
Almost 500 bucks later there was no change after replacing macerator . I saw the vacuum breaker, easy job if willing to take on.
I’m still wondering why my head is not pushing water out better to holding tank, I’ve already checked the sewage line and no obstructions after forcing water through it.