I have a friend that has or had them on his Artic Fox. Last winter at Yuma, AZ. the black tank valve went belly up, went on line and the only place to buy the valve that we found was from the manufacture. Of course it was a PITA to get to. Then shortly after, one of the gray tank valves bit the dust. He now is modifying for cables or some other way for opening. I did notice something while helping him, it was noted to place the pull opening at 10, 12, or 2 0'clock. Well that means closing the slide will work from the top down. When dumping tanks you know anything that doesn't come out will fill the slide slot at the bottom.
