I had two Arctic Fox Travel trailers that used remote hidden valves. It was a selling point because it kept the valves from being exposed to cold temps and weather.
But... the valves work with bowden cables that need the outer sheath to be firmly affixed at both ends. And, by firmly I mean rigidly affixed, no bending or movement. With the outer sheath solidly affixed then the only thing that can move is the inner cable that operates the gate valve.
But anyone that uses one of these on their TT can see that this external plate where the handle is mounted has some bending capable. So, when you push on the handle some of the force is transferred to the external mount. and that inner cable doesn't have full effect on the gate valve. I assume there is a similar lack of solid connection at the cable's end under the RV, too. But that's hidden from view.
Unfortunately, my experience with this type of set up over time was 100% failure on both valves on the two travel trailers I owned with this type of operation. I ended up removing the cables, opening fully the two gate valves tucked up in the underbelly and adding new direct pull gate valves on the pipping externally on each side adjacent to the main dump opening.
Manufacturers would be much better off using a solid rod to operate the valve rather than a bowden cable. Or at least strengthen the mounts on each end of the cable to allow zero movement when the handle is pushed or pulled.
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2017 Winnebago Adventurer 37F
2024 Lincoln Nautilus Hybrid Toad
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