Here's the deal with our overflow vent scenario.
On the starboard side we could use the deck fill rather than filling from inside, but our overflow is a tube under the bathroom sink, still vents inside but the bathroom has a floor level drain to sweep water in to. We could be T'd into an existing outlet, or it could be put into another dedicated through hull above the waterline fairly easily. The only time that the overfill would come into effect though is when you're filling up from above the water tank (at the deck) and then the water would basically squirt out the vent tube in the bathroom. We usually avoid all this mess by just WATCHING the darn thing. I goofed and walked away.
The port side though we had to sacrifice the deck fill water because of the larger refrigerator (there was no room to put in the refrig and keep the water lead). So we have to use inspection hatch for the port side. And if we're using the inspection hatch then it's impossible for an overflow valve as you are filling up the tank directly at tank level, it would never go up and out the tube. I guess it's possible I could put in a new water line from a different place on the deck to reach that port tank...but frankly the more lines there are with water leads the more opportunity for leaks and other things.
So that's our story...
Does it make a lick of sense?
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