I stumbled upon a novel tool for flushing my black water tank. I went to home depot to buy fittings to construct a wand to reach down into the tank through the toilet, but I found this instead. It threaded right onto the hose for the showerhead. It telescopes and the nozzle adjusts from 0 to 360 degrees. It puts out some pretty high pressure too. So far it seems to work well. And it was only six bucks. I probably would've spent more than that making my own.