On my 2016 450f, (owners version). the master head
on the Starboard side of the ship is having issues.
It appears that the water
from the holding tank
is back filling into the toilet bowl.
The good news is that it is a fresh water
flush and the layer of water inside the toilet fixture keeps the back filling from being smelly. That is very good news.
Upon further inspection
and several deductive reasoning experiments, it seems like the back fill is coming from the hose that is used to flush the toilet.
The back filling happens very slowly (taking several days to get to its full hight in the bowl). and in the several times it has happened, the fill level is always the same amount.
I am assuming that there are duckbill valves in the system and that one of them is faulty, thus allowing the water in the expulsion hose to seep back into the toilet bowl fixture.
So the question I have is:
Has anyone taken apart their heads?
Are there duckbills valves utilized in the factory lagoon
If so, how many are there and what size are they?
It seems like there are a couple of areas where duckbill valves could be installed, one is just after the flushing pump
on the bowl. (photo attached below)
The other is a break in the line that you access from under the lower storage
compartment just aft of the toilet fixture. (photo attached below)
I have attached the following photos for reference:
1. the toilet bowl
2. the flushing pump
3. the top of the holding tank
(the hose that leads to the toilet is on the right
4. a wide shot of the break in the hose line under the sink
5. a tighter shot of the hose line under the sink
If anyone has taken this system apart before or has insight on the amount / size of the duckbills, your input would be greatly appreciated
All the best,