05/21/2026
Which holding tank valve do you open first when you're emptying your tanks? The black one, right? And then the gray one to rinse out the sewer hose.
Nope. You open the gray tank valve first — for about 5 to 10 seconds. That lubricates the sewer hose and allows you to see if there are any leaks. Close the gray, open the black, and finish up with the gray tank(s).
Oh, and don't leave those tank valves open: If you do, liquid will drain off and you'll soon experience mounds, clogs, rotting waste creating smells, and other tank problems. Leave the valves open until you sensors read full (need some help getting them back reading correctly — hey, we know a company that can help with that!).