If you are a long-time Flo-Jet operator, you probably already know this.
After I cleaned out my tanks, I wanted to rinse out the pump unit while it was still attached to my RV by running a hose to the rinse valve of the pump.
I discovered that it is not a good idea to turn on the rinse port when the sewer gate valve is closed. If you do that, water will spray sideways out of the base of the unit, no matter how well the pump unit is sealed to the sewer's bayonet mount. This will happen even if the pump is running.
Not a disaster, but not fun, either.
2012 Fun Finder X-139 "Boondock Style" (axle-flipped and extra insulation)
2013 Toyota Tacoma Off-Road (semi-beefy tires and components)
Our trips -- pix and textAbout our trailer"A journey of a thousand miles begins with a single list."