Black tank flush

[Photobug]

I am a newbie here! Just got a 3021rl and was wondering if when flushing my black tank do I set it to normal flow or to fill to flush the black tank?
Thanks!

[JDDilly]

There should be a different hose hookup for the black tank flush. It doesn't run through the fresh water inlet.

[Daryles]

The "Normal Flow" is for normal internal water use in your faucets inside.
"Fill" is for filling your freshwater tank (when boondocking).

The port above the "Black tank" pull handle is for flushing your black tank. Mine was not labeled. I have corrected that since this picture was taken.
Connect a hose to this (make sure the water pressure is less than 50psi, the standard black plastic anti siphon vacuum breaker valve under your bathroom sink, is only rated for 50 psi.).


Do NOT leave this unattended when flushing your black tank. Many stories of stinky consequences if you do...