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My saniflo plus mascerator unit has a round opening on the top left corner?

My saniflo plus toilet has a small round opening on the top left corner. Water is comming up through this when it is flushed. Is this supposed to be capped? Does it have function?
Jeff, October 2009
This is the air vent, water goes in and the air comes out. Shouldn`t have any water coming out of it

Vekin, April 2010
Forgot to add it could be slight blockage so also check if the store has a cleaner suitable.

bob, October 2009
Only a guess it could be an none return airvent [keeps stink in but lets air in. Check with your local plumbing store ask if that's what it is and is it replaceable.

Bob, October 2009