Hint 1, don’t get in a hurry if your in line to dump, and some one is behind you.
Hint 2, don’t forget to take the cap off the dump end of the garden hose connector and run the pump.
Hint 3 if you didn’t perform hint 2, then be real careful when you realize what you have done, cause there now is a bunch of pressure now built up when you unscrew that cap, and IT WLL blow right out of your hand and down the sewage drain.