I can’t speak to the 2023’s, but the older units have a cover over the fresh water overflow port that you can slide up to remove and then add water there.
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2015 3100RL legacy...2005 Ford F-250 CC SB. Tows like a charm! 4/19 Updated to 2017 Chevy 3500 CC SB SRW -hope it tows as well as my F 250 did!
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