Black first, then gray
Originally Posted by redshift
Is this the sewer hose connection that rotates to align with the hole in the bottom of the compartment?
Most of the Thor units seem to. I bought a clear bayonet twist on 45* coupler fitting that I keep in place. I just twist down to dump and back up afterward with the cap on. You can watch as the tank empties. Drain the black first but leave the valve open. Then open the gray valve for a few (5-10?) seconds and some of its water will back fill the black. Shut the gray, allow the black to drain again. Repeat for as long as you have time. If you're in a hurry, with a line of fellow dumpers waiting, just once will do. Close the black before finishing the gray to clean the "Y". It's pretty much a no fuss operation. DO take the time to rinse your hose, but the gray discharge has done most of that.
I'm wearing trifocals now but my hindsight is 20/20.
Bilsteins and Sumos front and rear...HUGE! FatMat and Hoodliner...HUGE!
Hellwig sway bars F&R, 235/85 Hankook ATM, alignment...HUGE!!!
Battery watering, 260watts Solar and BigFeets to make life easier.