2023 320 CS-S Grey Water Flush Input?

FreewheelinFranklin

I'm trying to figure out how one flushes the grey water tank in our new 320 CS. The Nautilus P3 unit we have doesn't have a hose fitting in the Tank Flush location, and all the Nautilus instructions I've seen tell me I should be hooking up city water to this input to flush the tanks, but assume this is the black water or combined black/grey water tank. We have the cassette black water tank, and I expect that's changed how the system works. 



Seems like we'd still want to flush the grey water talk occasionally, no? Is there a way to do so that's better than simply running city water through the taps and down the drain with the grey water dump valve open? 

Thanks!

techietab

I mostly just run water down the drain to fill and flush the grey tank, but I occasionally use a Camco 'Blaster Pro' tank rinse adapter to flush the grey tank on my 2022 320 S: 
https://www.amazon.com/gp/product/B00T36LJF2/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1