Originally Posted by CanoeStream
There's a sticker below my black water rinse inlet states that it should not be used unless the waste gate is open. You might find it will work if you were at a dump station with a stinky slinky in place and the handle pulled.
I think the sticker is there only as a warning so that you don't inadvertently overfill your black tank which is possible if the waste gate is closed and you aren't paying attention.
I use my rinse all the time with the gate closed when I'm cleaning my tank. First I dump. Then I run the rinse a minute with the gate still open. Then I close the gate and count slowly to 20 to let the tank fill up partially to help catch and dislodge anything left behind. I repeat this partial-fill and dump procedure two or three times before I close the valve for the last time, partially fill again to leave some liquid to slosh around, and then dump the gray.
To answer Resorts question, mine has never clogged up. And you are correct that it is quite noisy and can be heard from twenty feet away!