duckbills

My Vacuflush system for the master head pumps continuously, no water is leaking from the head. Read earlier might be the duckbills? If so any idea what part number to order and is they a video showing how to replace? Thanks. Rob

We have a clog. Pretty sure that something went down thru the master head. Read the posts about how to change the duckbills but how the heck do you get to them? It looks like I can only see the system from the floor opening outside the master stateroom. If this is the only access, we will have...

My vacuflush was not flushing, the vacuum pump was making noise, and I read every thread I could find to try and determine the problem. Water was staying in the bowl, so I deduced that there was either a blockage or...the dreaded "duckbills" had to be replaced. In all the threads, I couldn't...