I guess if it just dumps strait to the ground there is good chance it wouldn't be something that would need a dumping station.
My fresh water tank has (I think) a 1/2 or 3/8 plug which I changed out to a ball valve. I have never seen a knife valve set up like this before. Must be the make, model and size of of the fresh water tank. You Islanders are pretty smart just try to keep everything in focus and watch your depth of field.
PS are u glad The NHL is back?