DuckBill Valve?

T

TurboWarp

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Last year my electric toilet started having water backup from the tank. To resolve the issue I would just flush. After a day or so, it would backup again. The tank was not full. Would this be the duckbill valve?

Any idea how much it should cost to have this replaced? I want to have it fixed before the toilet is comissioned and used.

Thanks...
 
Sounds like it could be the duck bill. What brand and model of head is it?
 
Mke sure you tank vent line or lines are clear. It could be pressure building in the Holding tank.
Bill
 
Go over to the marine sanitation forum. VIc, the moderator can answer questions like this in his sleep.
 
It's a $12.00 part, about 10 minutes to replace. It easy to do on a crown and any other toilet I've seen.
 
Thanks. I am not sure of the brand. Glad it is only about 10 minutes of work.
 
In just about all marine toilets, the duckbill valve is inside the discharge fitting. This is the fitting where the large discharge hose (the bigger one of the two) connects to the toilet. The duckbill valve (also called a joker valve) is inside this fitting. The duckbill valve is a molded rubber one-way check valve, that is supposed to stop backflow from returning to the toilet. They don't last forever, their useful life is usually 3-5 years, then they have to be replaced. Sometimes you can get away with removing the fitting from the toilet with the hose still attached to it. But more often than not, due to stiff hoses and lack of room to work, the hose will have to be taken off first.

Note the mention of the holding tank vent, too. If it is plugged up and the air inside the tank cannot escape as the tank fills, then the tank will begin to pressurize and make it much more likely for the sewage to back up into the toilet - it will take the path of least resistance...
 
quote:
Originally posted by Vic Willman

In just about all marine toilets, the duckbill valve is inside the discharge fitting. This is the fitting where the large discharge hose (the bigger one of the two) connects to the toilet. The duckbill valve (also called a joker valve) is inside this fitting. The duckbill valve is a molded rubber one-way check valve, that is supposed to stop backflow from returning to the toilet. They don't last forever, their useful life is usually 3-5 years, then they have to be replaced. Sometimes you can get away with removing the fitting from the toilet with the hose still attached to it. But more often than not, due to stiff hoses and lack of room to work, the hose will have to be taken off first.

Note the mention of the holding tank vent, too. If it is plugged up and the air inside the tank cannot escape as the tank fills, then the tank will begin to pressurize and make it much more likely for the sewage to back up into the toilet - it will take the path of least resistance...

Click to expand...


Very helpful advice , HeadMaster!
With the hose off does the duckbill/joker generally just pull out, or are there fasteners?
 
Head Master,

Thanks or the explanation. I will find out what brand toilet I have and replace the db valve and the vent.

Thanks !
 
With the vent Mud Daubbers or Wasps love to build nests in the hull fitting, If you have a vent filter if it ever got wet it's pretty much toast also check the vent hose for clogs. Dues you waste tank have an inspection plate? If so remove it and if the tank is building pressure prepare to open all the windows fast if you don't use something like Oderless or a treatment chemical. I suppose it could be the duckbills but normally bad duckbills would result in the head losing water after it is flushed or when it sits for a few minutes or hours.
Bill
 
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