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Those check valves are NOT certified nor adequate for Black tank service! Do yourself a favor and invest in check valves certified for that use. Otherwise, you could have a disaster on your hands. Personally, I would never combine fresh and flush hoses together.
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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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