Originally Posted by Bocephus
and by the way....what does that flush port actually do? is there some sort of nozzle inside the tank to disperse the water to various areas, or is it just a hose that drains right into the tank?
Depending on the unit installed at the factory, some have a rotating spray head and others have a nozzle that shoots water out under pressure.
There is a one way "anti-siphon" check valve in the line (usually right above the port. If it was not there a full black tank could siphon black water out of the hose fitting.
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