That is the hose receptacle for the fresh water tank. You would need to pour several gallons in there to circulate through the entire system.
What we do is drain the lines with gravity and then use a fitting to blow air through the system until all the faucets run nothing but air through them.
You can get a fitting that goes into the hose inlet in your wet bay that adapts to an air hose.
Then pour anti freeze into all the drains so the traps are full of it.
We've done this for years and never a problem plus we do not have that awful taste that anti freeze leaves in the lines.
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Jim and Carol Cooper with Oreo the Kitty
FAA ATC ret, VFW, Legion, VVA, NRA
2012 Journey 36M, Cummins 360hp, 2015 Ford Explorer Blue Ox, AF1
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