Thanks all. I spent 3+ days tearing out old sanitation hose. I have seen things that is giving me nightmares.
The old vent line did attach to the described screened thru hull. The line went up the contour of the hull and exited toward the gunnel. In my quest to help the tank breathe, i was going to put a mushroom thru hull, etc. However, as mentioned in my posting, the old line is gooped in so well and we can't squeeze in to where it travels (behind head vanity) to extract the hose.
The holding tank has the standard 1/2" thread to 5/8" hose barb on it. I don't know how I would make that hole bigger to include threading it for a larger fitting. I am pondering running the vent line to the opposing side of the boat in an effort to make the hose travel straight and shorter which means putting a new hole in the hull which I'm not thrilled about either.
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