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we have the exact same rig
That port you have circled is the rear tank flush, looks like they forgot to label it. It will make a strange noise when you apply water to it, I believe it is the rinse nozzle in the tank. Both of mine do that when i am flushing the tanks.
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2021 Montana 3761FL, 9 LIFPO4 batteries & 1700 watts of panels w/ Multiplus II 3K inverter and 30amp DC to DC charger from truck. 8k Dexter axles w/ Kodiak disc brakes.
2019 6.7 diesel F350 DRW with Banks derringer and 4"exhaust, airlift bags, 25k B & W Companion hitch, 45 gal. aux. diesel tank and 14k Winch, just in case!
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