Was sitting one day at the dump station, slowly filling the black tank up from the dump valve side of the tank, when it dawned on me that what I was really doing was pushing all the stuff back into the tanks...hoping it would come out on the second try, or the third, or the fourth...
Eureka, put one of these on the black tank, one on the gray tank. Mounted the hose connections (put quick connects on them) right next to the tank valves. Pull the black handle...while emptying, attach hose to the black Tornado connector, turn on, flush until clear...about 3 minutes. Repeat for the gray tank and we're outta there. Went from 20 minutes and more at the dumpstation to just a bit more than 10. Happy camper, definitely.
Two things though...they should provide longer hoses, both my tanks were longer than the lengths of hose in the kit - made extensions out of an old fresh water hose. Second - they need to make their water pressure recommendation in bigger print or somehow more prominent. It is there, just way at the end of the instruction page and well past the point most people would have quit reading, thinking they were finished. I've read some reviews where people complained about them "blowing up" or breaking. I suspect that they were using unregulated water pressure and just turning the valve on full tilt. I use a 40 psi regulator on the hose and slowly open the valve to let them "spin up" gradually and have had no problems. Looking at how they are made when I installed them, I can see how a sudden burst of water, particularly a high pressure burst, could cause them to either seize up or blow apart. Keep the pressure down, open the valve slowly and they work just fine :-)
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