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My 2006 3500RL came with the tornado and I'm sure glad I have it. No problems so far, so no complaints. I'm guessing there's an antisiphon in there somewhere, but I also use one at the inlet prior to the incoming hose and believe it can't hurt. So far, so good. But I do close off the black tank while the sprayer is on, let the black tank fill, THEN empty the contents. It can can a few of these before I'm happy with the exiting water.
From my web searches the tornado just pressure sprays in all directions of the interior in an attempt to spray the walls cleaner than not. No moving parts needed other the the water being sprayed around. I wish I had tornados in the gray tanks, but I'j just not that ambitious.
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