My horror story occurred this past winter with my Big Sky, which was the final staw granted it was human error also possibly. There was some toilet paper stuck in the groove where the door on the valve slides into when closed so I flushed it and went to work. Got the valve out and cleaned it out. Trying to get it back in with the gaskets perfectly in place... Fitting 1 1/2" into a 3/4" area makes a person cuss so much you either make up new words or learn them in a different langue. Finally got it, proud of myself I filled the tank with water to see if it held water. It leaked.... And had a new blockage... Only way to unblock it was take the valve out and took a welding rod, stuck it up there and try not to get 40 gallons of water and whatever else on you
. Needless to say I was up sh** creek without a paddle... Almost literally. Hence why I had a valve put on the very end of the pipe of the dump station.