There is an expert who's web URL I ahve around here somewhere (RV101 is part of the URL) he too supports a second hose for the black tank rinser and as I posted above a quick disconnect,, Disconnected save when in use
In fact I use a single "Y" with two hoses (well one hose one filter) the water comes off the Y into the Filter and then the city water/quick fill inlet
Or off the "Y" into a hose.. The other end of that hose has a vacuum breaker, a spring check valve (Belt and suspenders back flow protection) a valve and a quick disconnect.. It currently feeds the sprayer head watering my tomatoes.. But it also fits the mating QD fitting on the "Tornado" and after I made up the ose I found the vacuum breaker inside the RV, and of course the Tornado has a spring check valve (Belt, Belt, Suspenders and Suspenders back flow protection).
Ok so it's over kill but even if I lay that hose in a puddle, NOTHING gets back into it save from the inlet end.
