Advice needed for installing new holding tank setup

[Cheechako]

Originally Posted by wsmurdoch

Cheechako, you have a long vertical hose from the toilet discharge to the top of the holding tank. Does the large amount of material in the hose above the duckbill valve leak through the valve and refill the toilet bowl or does the extra weight of the material in the hose do a better than average job of pushing the lips of the duckbill valve together stopping any leak through the duckbill valve?

Well, I just saw this question now... it was no problem for leakback.

[Don Distante]

Yes, thanks for the info. on potential Coast Guard issues. I was planning on locking the thru-hull